Hi, I just figured out how to do it. This is the code:

Forms!frm_Main.frm_sub_A.Form.aField_01 = Forms!frm_Main.Field_01
Forms!frm_Main.frm_sub_A.Form.aField_02 = Forms!frm_Main.Field_02


In fact, it’s just a test form so I understand how it works.
In reality, I want to have similar input mask where, when a button is clicked, certain data (not all) is transferred to the general ledger.


Thanks for the help so far