You have got 2 tables, "tblDocument", and "tblClient". Populate RELATIONSHIPS (tblClient : tblDocument, 1: more). Make a Main Form on tblClient, and form on
tblDocument. Thise second form put in Main Form as a SUBFORM. Link them via
LINK CHILD FIELDS, and LINK MASTER FIELDS properties (in Subform). Tray to enter 1 record in Main Form, and for this Client more records in Subform.