Web Portal - Creation of a form with 2 insert in 2 different tables

in OneIdentity 9.1 I have customized the Web Portal through WebDesigner tool creating a custom form to make an insert in a single table.
Is there a way to create a form with fields from 2 different tables?

Basically I have to compile a form and do insert in TableA and insert in TableB with values of form fields. Any suggestion?