I welcome all who have come to this post. Now I'm going to teach you how to add several different objects to one file. we have two XML files. we need to open the second file and copy everything from <DesignerPart to </DesignerPart>.After that, edit the first file. Find at the very end </DesignerPart> create a new row and insert into a new row all we have copied before. Save the first file, delete the second file. now restart the game. Profit!