There is- but why bother?
IF any of the people would appear in more than one tree is is best to leave them all in one tree- otherwise, when yous start putting them in different trees you have duplicates, etc.
If they are all in one tree people can still find them using a search.
I find it *very* irritating to find the same person in multiple trees that have all been posted by the same person when doing a search.
I've never understood the logic. Maintain all your people and all your connections in one tree and simplify your life and the lives of all those searching for people in your tree.