In an Access 2016 database(attached) I have a table of machine set up records called tblSetup. Records need to be added to this table via form frmSetup. I need to verify that the Part_num, Press_num, and Oper_num are valid by comparing to tblRouting without disturbing existing records. A combo box seems to be the best way to do this. I believe that would verify the values are valid by automatically starting the entry by writing those three fields. Is that the best method of doing this ? If so what are the steps. Thanks.