Exchange Data between two subforms

C

CP

I have a form containing two subforms lets say MainForm, Subform1, Subform2
They have the following fields
Mainform - MainID, Info1, Info2
Subform1 - SubID, MainID, Info3, Date1
Subform2 - ID, SubID, Info, Date2

So they have links where needed

What I want to do is when updating Date2 is to change Date1 by Date2
+12months giving a yes and no confirmation box first.
So I first have to do the calcualation then put the new value in another
subform field and ask the question

Like - Are you sure you want to change Date1 to xx/xx/xxxx ? yes or no.

Many thanks for any help
 

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