Hi Roger, Welcome to Wikitree!!
I am presuming you are talking about moving your MyHeritage tree over to Wikitree and don't want to manually add each person.
If you have a GEDCOM of your tree you can upload it here, and once completed it will populate your tree into Wikitree.
Please see the help files here
https://www.wikitree.com/wiki/Help:GEDCOM.
Those pages will guide you through the Wikitree process of adding your GEDCOM.
Happy researching :)