Options for the ‘Save’ button creating all the answers:
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Use the ListShifter or Orchestra plugin to run a Workflow for every ‘Question’ in the repeating group, grab the response, and create an Answer for each item. This might be good for a small number of items but might not be too efficient if there are a lot of questions
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Similar logic to the above, but each workflow can Schedule a Backend workflow to create the Answer if you need/want the Answer created on the backend instead of on the page
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You can use the ListShifter or Orchestra plugin to build out the Answers in a single JSON structure when the Save button gets pressed, and then send the JSON to a Bulk API endpoint which will create the items on the backend. Some discussion about this from a high level (not exactly how to do it though) can be found here: Create multiple things, FAST
All the above options do not need to interact with a Custom State, so the second question would not be needed. You may only want a Custom State to make sure all required questions have valid input.