Main Form Subform on Data Entry populate field

I

ICMom

I am really new at working with forms and hope I explain myself clearly. I
have a main form that lists items based off a wild card query, then it lists
all the item descriptions that matched the search. If you select one of the
records and click on a command button then a child form is opened in a popup
form displaying all the transaction records related to this specific item
description.
The problem is when I have all the transactions listed then I would like to
just add a record. I want the description field to automatically populate
based on the original item description that was selected on the main form.
Both forms have a productid and the child form shows that it is filtered on
the productid.
Can someone please point me in the right direction?
Thanks in Advance
 
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