If anyone can help me would be great.

I have read the catalogue and didnt really grasp the idea on how it works specifically for my case.

I have a problem where i dont know how to connect a unique userid with multiple lets say invoices it has on one form. it continues to generate them separetly the list of the invoices is as follows: invoice numb, date and amount. - all given the unique id.

Can please anyone help me on how to resolve this issue.

Best,
gigovv