data from other tables

How can i show data(or some fields) form a table B on a form A.and the Table B is not the Source table of form A.

You need to some how get or find the record from table B. Say on the sales order header you want the sell to customers tel no If not cust.get(sell-to cust no) then Custminit; Now just put a new controx box on the form with source expression cust.“Telephone nom.”