• All of the groups that existed in the original definition must remain in the new definition. You cannot add new groups or change the names of existing groups.

• If you add new variable text or change the name of an existing piece of variable text, the new name must be the same as the name of the existing variable text in the original.

• The height type of the symbol instance must be the same in the new symbol as it was in the original.

• The Left Leader and Right Leader placement types must both exist in the new weld symbol.