Scheduler (plugin)

hi,

i'm novice but i can suggest you a way.
why can't you create 3 differents course which a scheduler in each one ?
so, one course for each category

or

a 3 activities of shedulters ? one scheduler for each category

or

3 topics in the course, and 1 scheduler in each topic.

in the final view of the agenda, you can overlay the different scheduler to get the same result.

If i'm not wrong, Google calendar use the 2nd way i suggest you (as many calendar as category needed)

Pierre