How do I update a Word form that originated in Excel without losing...

I don’t know the name for what I need.

I have drop down menus and check boxes in my form. I needed to change some options in the drop down, specifically, delete and add an e-mail address.

Once I changed/updated the drop down menu I lost the ability to have a drop down menu. I also lost the ability to have check boxes.

I had started to recreate it all from scratch, but have no idea how to create a drop down menu/box. X boxes I can make, but don’t know how to do the other.

Any advice, or suggestion where I go online to help me solve this issue?