I have looked at your 2003 version.
First of all I am not sure why your 2 sub tables that supply data to the Contract_Tbl are not set to One to many reletionships as the Profile_Tbl is, as they should be.
Next your Contract Form is Not a "Subform", it is a stand alone form on a separate Tab, it should be "inserted" in to the Profile form as a subform with the Master/Child links set to Master Profile_ID to Child Profile_ID_SK.
This means that any new records added to the Contract Sub Form will automatically be related to the correct Profile.