I want to move an existing field (with existing data) from the product variation to the product display.

In this case I want to move the images field, because I am going to have hundreds of products in one node, and each needs the exact same image (and I am low on disk quota).

The closest thing I can find related to this problem is this question, but I have been unable to find any information anywhere else. I would really appreciate a hint.

I think there must be many cases where people retroactively decide to move fields from either the product to the product display or vice versa, so hopefully this will be useful to someone else, too.

Thanks in advance