diff --git a/src/core/operations/Fork.mjs b/src/core/operations/Fork.mjs
index 6e961990..3d4c596a 100644
--- a/src/core/operations/Fork.mjs
+++ b/src/core/operations/Fork.mjs
@@ -65,12 +65,21 @@ class Fork extends Operation {
         if (input)
             inputs = input.split(splitDelim);
 
+        // Set to 1 as if we are here, then there is one, the current one.
+        let numOp = 1;
         // Create subOpList for each tranche to operate on
-        // (all remaining operations unless we encounter a Merge)
+        // all remaining operations unless we encounter a Merge
         for (i = state.progress + 1; i < opList.length; i++) {
             if (opList[i].name === "Merge" && !opList[i].disabled) {
-                break;
+                numOp--;
+                if (numOp === 0 || opList[i].ingValues[0])
+                    break;
+                else
+                    // Not this Fork's Merge.
+                    subOpList.push(opList[i]);
             } else {
+                if (opList[i].name === "Fork" || opList[i].name === "Subsection")
+                    numOp++;
                 subOpList.push(opList[i]);
             }
         }
diff --git a/src/core/operations/Merge.mjs b/src/core/operations/Merge.mjs
index 07123aee..573e62e0 100644
--- a/src/core/operations/Merge.mjs
+++ b/src/core/operations/Merge.mjs
@@ -20,10 +20,16 @@ class Merge extends Operation {
         this.name = "Merge";
         this.flowControl = true;
         this.module = "Default";
-        this.description = "Consolidate all branches back into a single trunk. The opposite of Fork.";
+        this.description = "Consolidate all branches back into a single trunk. The opposite of Fork. Unticking the Merge All checkbox will only consolidate all branches up to the nearest Fork/Subsection.";
         this.inputType = "string";
         this.outputType = "string";
-        this.args = [];
+        this.args = [
+            {
+                name: "Merge All",
+                type: "boolean",
+                value: true,
+            }
+        ];
     }
 
     /**
diff --git a/src/core/operations/Subsection.mjs b/src/core/operations/Subsection.mjs
index 86980e40..1093917b 100644
--- a/src/core/operations/Subsection.mjs
+++ b/src/core/operations/Subsection.mjs
@@ -67,12 +67,21 @@ class Subsection extends Operation {
             subOpList   = [];
 
         if (input && section !== "") {
+            // Set to 1 as if we are here, then there is one, the current one.
+            let numOp = 1;
             // Create subOpList for each tranche to operate on
             // all remaining operations unless we encounter a Merge
             for (let i = state.progress + 1; i < opList.length; i++) {
                 if (opList[i].name === "Merge" && !opList[i].disabled) {
-                    break;
+                    numOp--;
+                    if (numOp === 0 || opList[i].ingValues[0])
+                        break;
+                    else
+                        // Not this subsection's Merge.
+                        subOpList.push(opList[i]);
                 } else {
+                    if (opList[i].name === "Fork" || opList[i].name === "Subsection")
+                        numOp++;
                     subOpList.push(opList[i]);
                 }
             }
diff --git a/tests/operations/index.mjs b/tests/operations/index.mjs
index b6beb081..1e9dbbb1 100644
--- a/tests/operations/index.mjs
+++ b/tests/operations/index.mjs
@@ -114,6 +114,7 @@ import "./tests/HASSH.mjs";
 import "./tests/GetAllCasings.mjs";
 import "./tests/SIGABA.mjs";
 import "./tests/ELFInfo.mjs";
+import "./tests/Subsection.mjs";
 
 
 // Cannot test operations that use the File type yet
diff --git a/tests/operations/tests/Fork.mjs b/tests/operations/tests/Fork.mjs
index d7ee918c..05fde17e 100644
--- a/tests/operations/tests/Fork.mjs
+++ b/tests/operations/tests/Fork.mjs
@@ -31,7 +31,7 @@ TestRegister.addTests([
             },
             {
                 op: "Merge",
-                args: [],
+                args: [true],
             },
         ],
     },
@@ -50,7 +50,7 @@ TestRegister.addTests([
             },
             {
                 op: "Merge",
-                args: [],
+                args: [true],
             },
         ],
     },
@@ -66,5 +66,16 @@ TestRegister.addTests([
             {"op": "Label", "args": ["skipReturn"]},
             {"op": "To Base64", "args": ["A-Za-z0-9+/="]}
         ]
-    }
+    },
+    {
+        name: "Fork, Partial Merge",
+        input: "Hello World",
+        expectedOutput: "48656c6c6f 576f726c64",
+        recipeConfig: [
+            { "op": "Fork",   "args": [" ", " ", false] },
+            { "op": "Fork",   "args": ["l", "l", false] },
+            { "op": "Merge",  "args": [false] },
+            { "op": "To Hex", "args": ["None", 0] },
+        ]
+    },
 ]);
diff --git a/tests/operations/tests/Subsection.mjs b/tests/operations/tests/Subsection.mjs
new file mode 100644
index 00000000..6a181985
--- /dev/null
+++ b/tests/operations/tests/Subsection.mjs
@@ -0,0 +1,102 @@
+/**
+ * Subsection Tests.
+ *
+ * @author n1073645 [n1073645@gmail.com]
+ * @copyright Crown Copyright 2022
+ * @license Apache-2.0
+ */
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        name: "Subsection: nothing",
+        input: "",
+        expectedOutput: "",
+        recipeConfig: [
+            {
+                "op": "Subsection",
+                "args": ["", true, true, false],
+            },
+        ],
+    },
+    {
+        name: "Subsection, Full Merge: nothing",
+        input: "",
+        expectedOutput: "",
+        recipeConfig: [
+            {
+                "op": "Subsection",
+                "args": ["", true, true, false],
+            },
+            {
+                "op": "Merge",
+                "args": [true],
+            },
+        ],
+    },
+    {
+        name: "Subsection, Partial Merge: nothing",
+        input: "",
+        expectedOutput: "",
+        recipeConfig: [
+            {
+                "op": "Subsection",
+                "args": ["", true, true, false],
+            },
+            {
+                "op": "Merge",
+                "args": [false],
+            },
+        ],
+    },
+    {
+        name: "Subsection, Full Merge: Base64 with Hex",
+        input: "SGVsbG38675629ybGQ=",
+        expectedOutput: "Hello World",
+        recipeConfig: [
+            {
+                "op": "Subsection",
+                "args": ["386756", true, true, false],
+            },
+            {
+                "op": "From Hex",
+                "args": ["Auto"],
+            },
+            {
+                "op": "Merge",
+                "args": [true],
+            },
+            {
+                "op": "From Base64",
+                "args": ["A-Za-z0-9+/=", true, false],
+            },
+        ],
+    },
+    {
+        name: "Subsection, Partial Merge: Base64 with Hex surrounded by binary data.",
+        input: "000000000SGVsbG38675629ybGQ=0000000000",
+        expectedOutput: "000000000Hello World0000000000",
+        recipeConfig: [
+            {
+                "op": "Subsection",
+                "args": ["SGVsbG38675629ybGQ=", true, true, false],
+            },
+            {
+                "op": "Subsection",
+                "args": ["386756", true, true, false],
+            },
+            {
+                "op": "From Hex",
+                "args": ["Auto"],
+            },
+            {
+                "op": "Merge",
+                "args": [false],
+            },
+            {
+                "op": "From Base64",
+                "args": ["A-Za-z0-9+/=", true, false],
+            },
+        ],
+    },
+]);