I currently only have one branch of my tree on WikiTree. The rest of my tree (which is very extensive, comprising well over 1000 individuals) has been built on a different platform but I can save it as a Gedcom file. What I would like to know is whether I can merge this Gedcom with my existing Wikitree tree and merge any individuals that appear in both Gedcoms? If this can be done how would I proceed? A step-by-step guide would be helpful as I find the existing instructions on Wikitree are difficult to follow.