Add new from a parent list to a child list

Hello,

This is a parent/child list question. Is it possible in Nintex forms to have a button on the parent form that when clicked adds items to a child list and take some of the fields from the parent list and put that data into the each item in the child list.  I know we can do it with a workflow, but then there's the delay while the workflow runs to create the items in the child list.  A button would be fantastic.  Has anyone done this with Nintex Forms?