Form fields update a seperate table

[paperbag1]

I have a form named Material Order. On this form I have a field named Job Name on Table A which is linked to Job Name on Table B (Job Addresses). This field setup as a pop-up list which in turn fills in the address fields below. As new jobs arise, I would like to be able to fill in the information and have it be placed in Table B so as not to have to enter the information directly into Table B. I have tried using Set Field but none of the information ends up as a new record in Table B.

Thanks,

Phil