althea
In many situations, with a normalized database, it is not necessary to "copy" the data from table an insert it into another table.
For example, when creating an invoice, the data entry person would select the customer. The invoice would then using the address associated with the customer for the invoice. The invoice would only have a reference, a foreign key in the invoice file that links to the address.
For this situation, rather than populate combo boxes which can be done using the customer number as the reference, I suspect it would be more typical to have a subform that includes the address plus customer number. The subform is linked to the main form with the customer number.
If your needs are different, and / or, your database is not normalized (a design process which includes the removal of unecessary data such as redundent / duplicated data), then review the use of the function [blue]DLookup[/blue] in Access.
Richard