Yet to get to play with Nintex.
Excuse my ignorance but what is a master/detail form?
Do you mean a master view and then copy pieces onto other views. This takes practice and is subject to lots of changes until form users/designers really know what they want.
I often create a dummy view and on here I'll create dummy tables/buttons/rules/Headings which I can then format until the dummy pieces are "perfect", These I can then copy from view to view as I know I'll always have more than 1 view in all my form. I always know that I'll have at least 4/5 views by default.