Started to add output property decomposition info

Author: Cortex-DMS

content/en/docs/2024.9/Reference/Concepts/fundamentals/blocks/block-properties/what-is-a-block-property.md

@@ -37,7 +37,7 @@ The icons used for Input properties are dark blue to distinguish them from [Outp
 
 ### Output Properties
 
-Output properties are used to save values from a [block][]. These properties will saved to a variable during the block's execution.
+Output properties are used to save values from a [block][]. These properties can be saved to a variable or decomposed to be saved into multiple variables during the block's execution.
 
 Values from Output properties can be [discarded][Discarding Outputs], this means they will not be saved to any variable.
 
@@ -51,6 +51,37 @@ Output properties can be configured using the following editors:
 
 The icon used for Output properties are light blue to distinguish them from [Input Properties][].
 
+#### Decomposing Output Properties
+
+Output values can be decomposed to allow the saving of different parts of the value to different variables.
+
+To decompose an output value, the output property will need to be set to an expression. As an example, an output value value contains a Json object, e.g:
+
+``` json
+{
+    "company": {
+        "name": "Company Name",
+        "department": [
+            {
+                "name": "HR",
+                "employees": [
+                    {
+                        "name": "Joe Blogs",
+                        "id": "101"
+                    },
+                    {
+                        "name": "Jane Doe",
+                        "id": "102"
+                    }
+                ]
+            }
+        ]
+    }
+}
+```
+
+To decompose this structure and store a part of the value to a variable, e.g. the syntax would be
+
 #### Discarding Outputs
 
 Output values can be discarded, instead of saving them to a variable.