So that when you move the cursor through the records of the main table in the subordinate, only the records corresponding to the "tb4_id" field are displayed.

The example is on the link
http://transfiles.ru/ecxdt

    1 answer 1

    This is the standard Aktsessa functionality. You make the main table base for the form, create another form for the subordinate, place it on the form with the main table as a subform and link it along the key field through the properties of the subform (the Data tab, fill in the fields for the connection).