How to append value from subprocess in a single variable of array type?

Question

Hello All, 
 I have an array variable in my parent process model. Depending on the number of values it holds, I'm running a subprocess for each instance. Every time the sub process completes it execution it returns one value that I need to store in a variable of parent process model but i don't know exactly how I can accomplish this feature. Can someone please help me here? I can give an example to understand the requirement correctly. 
 
 Suppose a variable in parent process model consists below values 
 var1:{1,2,3,4}, 
 Now the subprocess is running for each values in variable var1 i.e it runs 4 times as the var1 has 4 values. Everytime the subprocess executes it returns some value. Suppose subprocess returns {a,b,c,d} respectively for each values in var1. Now I need to store this returned values into an array variable inside my parent process model, So that it can hold all the returned values.

Sandeep Deshmukh · Answer

Hi , 
 
If every time your instances is coming out from Sub process to Parent Process then 
1)use one Script task after that sub process node and in Output tab, while saving into that array variable use "is Append to" Operator to store /append returned value. 
2) Inside your Subprocess only (before ending process) try to append that returned value into array PV and map it "Pass by reference" with Parent Process PV. 
 
Hope this will work. 
 
Thanks, 
Sandeep

Sandeep Deshmukh · Answer

create 2 array PV with same type and check parameter option for sub process pv and map that pv in sub process node input section. (or use byreference function from expression while mapping)