Replace triplet rests with Pitches?

Writing a drum part. I want to fill a bar with triplets and then revoice it.
In Finale I used to start with a little script that filled a bar with triplet rests and then cursor through and add various drum sounds to make a fill.
How would I do this in Dorico?
I can fill a bar with rests, but then when I try to replace em with sounds it writes regular rhythms - it looks like it automatically creates another voice. Is that what’s happening?

Can you upload a screenshot?

I think I mighta figured it out. Dorico wants a full explanation for all entries…
if I want to add other instruments to a triplet in a drum part, each new sound needs a complete rhythmic definition, and cannot be added to the stem of an existing sound - unless they’re both entered at the same time.
After getting a bar full of entries, I’m able to move em around to another sound OK with the arrow keys…
In an instrumental part, lock duration and repitch with polyphony will work just like the Simple>RePitch tool in Finale.