Hi Wayne, Thanks for joining us!
If the information is details you want to add to existing profiles, it would be best to enter the additional data by hand because we can't replace one gedcom with an updated one. Other people may have made contributions to those profiles since they were originally created and we don't want to delete their work.
If the information is new individuals that will create new Wikitree profiles, you should be able to create a Gedcom of those new individuals and use the Gedcom to create the new profiles. Keep in mind that you don't want to create duplicate Wikitree profiles, so it might be easier and a more certain method to enter the new individuals by hand to make sure they are attached to their parents, siblings and other famiy members without a disconnect. Disconnects from other family members are common with Gedcoms.