Help Adding the +/- button to the first item in a Group

I am trying to create a simple drop down or expandable field that allows me to simply click a +/- in the top cell of a group to expand that group so I can enter data...then close that group and open a new group. Very similar to just creating the group with the plus and minus on the left of the worksheet....but I want a button in the top cell of each group. Is that possible?

Thanks so much.


Expandable Field Sample

I created something I believe is what you are looking for. A client of mine had groups withing other groups, and he wanted the ability to open up these nested groups, an unlimted #, then be able to close them. I have created a sample video for you of what i did so you can watch and let me know if this is what you had in mind:

Please let me know your thoughts on this.

Cannot say it is possible or

Cannot say it is possible or not. It is a vast area with many tools. May be possible. Let me know if you get.