Fetch SubForm data from another Creator app

Fetch SubForm data from another Creator app

I'm looking to pull data into one Creator app from another, I have successful pulled in individual fields from the Parent form using a Function. But I also need to pull in data from it's SubForm and I'm having trouble getting it working 

The Function code I am using for the Parent form fields is:

  1. string arAccess(int Ar_Lu)
  2. {
  3.     fetchAr  =  Area  [ID == input.Ar_Lu;
  4.     return fetchAr.Ar_Name;
  5. }
Any help much appreciated.

Thanks