I believe you can export and import a GEDCOM, but it is more work than it is worth. I just pick up the sources and paste them on Wikitree. GEDCOMs need to be compared so there are no duplicates created, then you have a monumental task of cleaning each profile and you still have to write the biography and add inline citations. Better to create each profile individually and check the Family Search research as you go (many very bad profiles and trees there).