Hi Steve
If you want what I think you want 
, play a midi “tap” along with the drums you have already recorded, quarter notes is fine, Then go to Midi>Functions>Merge Tempo from Tapping, then engage the tempo track and the sequencer will then be in time with the drums. If that’s what you wanted! I also find this a good way of straightening out the drums if they’re just a little off in one or 2 places, there are often bands that don’t want to(or can’t)play to a click. Hope this helps
Best Regards
Dave