Manually Assigning values for Ornaments

I noticed in my most recent snippet conversion that a trill has turned itself into a kind of "Envelope" that plays a specific rhythm which can be viewed by clicking "Expand Ornament" on the Right of the screen. I was wondering if it's possible to manually convert a group of notes into a trill, or if the only way is to play with the snippet editor until it spits out what I'm looking for.
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