creating linked records in multiple tables

[Guest_imported]

I am running a database that downloads information from an outside program. This information has multiple fields that need to run in a report. The problem is that I also need to tie the reference numbers on each record to a form that allows me to input additional data and associate it with the data that is imported. Essentially, when one new record is stored in the linked table, I need it to create new records in two other tables with the same primary key. Is there a simple line of code that can do this for me?

thansk for any help