I am not sure if the link Doug posted is of use to you or not, but in the new GEDCOM system WikiTree uses, the first goal would be to reject or accept all possible matches. The end result would be that your entire GEDCOM list is either matched to existing profiles, or blank (no suggestions or matches).
Once you reach that point, you will see an Add button for each profile. From the Help:GEDCOMpare page:
You add people one at a time after confirming or rejecting suggested matches.