I don't know how you have the form designed, but you can/could have the form default view property set to "Single Form View" and have data entry property set to NO.
When you click the "ADD DATA" button, open the form with the data entry property set to YES.
Otherwise open the form in EDIT mode.
The code would be something like:
Code:
Private Sub btnOpenFormAdd_Click()
DoCmd.OpenForm "YourFormName", acNormal, , , acFormAdd
End Sub
Private Sub btnOpenFormEdit_Click()
DoCmd.OpenForm "YourFormName", acNormal, , , acFormEdit
End Sub
One form to manage, not two......