I know NOTHING about programming. I am not computer savvy. I can work a program like my tax software, quickbooks, etc. But if my computer that allows me to use them messes up I am clueless as to how to fix anything on it. I can barely defrag it.
I can attach a copy of the format I have used so far. I don't know how to do that but willing to try. I would really like for this to work....
As I stated earlier, a PDF is a bit like paper. Which is why this is not so easy. A list where items disappear and all the other items then shift, is very dynamic. You've got items appearing and disappearing, and moving around. The only way to implement this on a PDF is with an existing PDF feature that is dynamic. Form Fields and Annotations are those features. You've used form fields before, but only in a static way, i.e, they don't move. The only way to make them move dynamically is to write a script to make that happen.
Here's a tutorial that shows how to add and delete items from a list field (#2 on my list):
https://acrobatusers.com/tutorials/list_and_combo_in_lc
Perhaps you should consider hiring a consultant to create this form for you. Contact me if you are interested.