Clone and rename invoice template

Clone and rename invoice template

I have a saved invoice template (my default).  I would like to know how to do the following...

1. I want to rename the original template, else clone and save with new name then delete original
2  I want to clone my default template so I can edit slightly and save with new name as 2nd template without starting from scratch to make a new template that is 95% same as my custom default.