create & edit 2nd/3rd pages within anoher page edit

This might be tricky, and I’m jumping into somebody else’s work here, and a little new to WordPress (though somewhat familiar with php and other CMS systems)

But we’re using a customized Woo theme (Appply) with customized sections in the “edit page” area. What I want to find out is if there is a way to create an edit/create area for a couple related pages: a gate page, and a disclaimer page. These pages are simple and use a predetermined template, so in theory there should only be a place to set text and title.

We want to avoid using plugins as much as possible.

Any suggestions on which way to go with this would be greatly appreciated. Thank you so much.