I have a main form that contains data from a table called tbl_Interim_Certificate that has a primary key field called Job_Reference. The subform is based on a table called tblFinalCertificate. The foreign key for this table from tbl_Interim_Certificate is also Job_Reference. What I want is that when I open the main form it automatically adds the job_Reference from tbl_Interim_Certificate to tblFinalCertificate. Any suggestions please.