I have two "linked" family trees. . . my mother's, back to the 1800's to 2021, and my father's, back to the 1700's to 2021. This year I started entering my sister-in-law's family into my father's Tree, linked to my bother.

I have entered over 1000 new names, but now I want her family tree as a separate website. To begin a third tree, must I re-enter each and every name? Can someone help me link without re-entering?