Is it possible to create a pop-up menu with sub-headings

I am trying to setup a pop-up menu in Number that would give me the ability to first create subheadings, that I can then enter my selection list in.

Example:

Subheading 1

eg 1

eg 2

eg 3

Subheading 2

eg 1

eg 2

eg 3

Subheading 3

eg 1

eg 2

eg 3

I did try to search for a solution to this, but nothing came up that I recognized quickly. So, I'm hopeful that someone out there in the Apple community has a quick work-around for acomplishing this.

Thanks,