Hi @palmer1, and welcome to Dorico. For this specific usage (lining up freely played music with no metronome for example), I would suggest to use Dorico in conjunction with Cubase 14: Cubase has the warp tool functionality, that is exactly what you may need for such cases, and then you can export your file directly as Dorico project: very neat 
Maybe this posts/thread are interesting for you (click to expand):
If you have any questions about polishing MIDI recordings directly into Dorico, please ask and post examples, and we will gladly help.