Appointments+ Feature Request please

Hi there,

I would like to request a new feature in Appointments +

I run a site for a local beauty salon. They have over 60 different treatment types that could (if this was possible) be categorised into sections.

I cant see any way of doing this at the moment.

What im basically asking for is a category list before you select the appointment type.
Eg in my situation i would select Waxing , Lashes or Nail then drill down into the actual appointment selection which would reduce the 60+ appointment types down to more manageable lists.