I have a sheet of trees that includes hills that must be drawn in the proper order, but I want the hills to have different 'effects' than the trees. I could create a 'trees before' sheet etc but some tree sets are in front of some hills and behind others in a nearly continous band that I like.

I think you need 'sub sheet lists" that can have other effects that combine with the current sheet using various blending options.

Sorry if someone already covered this, or there is another way to do this in CC3 that I haven't come across yet.

Regards,
-meleeguy