I have a custom post type that will let you create an online profile for my job board. So I am trying to split the form. I have come up with using tabs. Which I like but now I have two issues.
1. I have a tab for each section (personal info, about me, Education, etc). This allows me to split the form easily. But I can't create 2 forms for the same post type. Once you created it some of the items get locked and you can't remove them.
2. I like the fact that I am able to create a repeatable group from, but you can't add a repeatable group to a 'normal' form. In my personal info section I want to place the language repeatable group, but can't.
Dealing with the second point first, you are right, you cannot use a repeatable field group in a normal form.
Setting up post relationships and repeatable field groups was a major project for Types that was never quite finished in terms of providing parity with the workflows required on the front-end (using Toolset Forms) with what is possible in the backend. If there is enough demand for it from clients it will happen, but it means filing a request at https://toolset.com/home/contact-us/suggest-a-new-feature-for-toolset/.
Regarding the question of some form elements getting locked, I assume you mean within the visual drag-and-drop editor and the ability to remove required fields. If you switch to expert mode you will see the markup used to generate the form, and you can delete unwanted fields there. (You won't be able to switch back to visual mode without losing your changes, though.)