Can we add unrelated individuals?

Is there a way to add unrelated individuals? for example, the run a surname study for the variants of McGonigle. I want to start building trees of the families that i have assembled so far, so that people can possible connect theirs, etc. 

I also work on a number of family trees for my friends. We'd like to share them here to get them connected. 

So, is there a way to start a new "root" of a tree, to build off of, if it doesnt connect with any of my primary tree branches?


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