Create new note from existing note and templater

What I’m trying to do

Say I have a file called MyStuff—HiThere.md and I insert the template “TP_Template.md”. I want MyStuff—HiThere.md to remain unchanged and to have the template create a new file called “MyStuff.md” and then edit the file “MyStuff.md”.

Things I have tried

Searched internet for “Templater create new note”, but this is the wrong direction.