Mohamedbarkath:
Your question as worded really is very vague... I almost deleted it for lack of detail and clarity.
However, thru the magic of my super-secret-decoder-ring: It sounds like you need to refer to the parent form's control.
The solution for referring to parent form controls is quite simple; however, we normally require that you post your work first.
What doesn't make sense is your generic comment about
not being able to edit the form(s)? I can only guess that you mean that what you've tried doesn't work with the implication that you'd like some help - hence the need to see your work. It helps us help you in that the Experts get a sense of how much you know; thus, how to approach the question.
Please read:
Before Posting (VBA or SQL) Code then post your work.