I'm working on learning the new coach interface.  Has anyone came across any good resources on how to build in a drop down choice list in a coach?  

Hi Nicole,

There are different ways of configuring the single select control.  Have you looked at the official documentation?
https://www.ibm.com/docs/en/bpm/8.6.0?topic=toolkit-single-select

You can also manipulate the control via JavaScript APIs:

https://www.ibm.com/docs/en/baw/24.x?topic=api-single-select

I also see there are some videos out there as well, such as this one:

https://www.youtube.com/watch?v=23Az25HxX5w

Hope this helps,

Grant.