I want to be able to select multiple hours and have those sub lists pop up. How do I do that?

I have another question. I want to be able to select multiple hours and have those sub lists pop up. How do I do that?

You can change the hours to Multiple Choice Field and then use conditions to Show/Hide the sublists.

Guide: How-to-Show-or-Hide-Fields-Base-on-User-s-Answer

Give it a try and let us know if you need further assistance.