How to rename custom invoice templates using Custom Layout Designer / Sage Company Settings?

Hi,

Does anyone know how to / if it's possible to rename custom-designed invoice templates (built using the Custom Layout Designer Add-on)? I don't see an option in the layout designer other than save as, & you can't do anything except select from a drop-down in Sage itself.

I am unable to delete old invoice / statement layouts that are no longer in use, even if I unlink them from every customer on file, because they have a print history. So I would like to be able to at least rename them so that I can avoid confusion in which layout to select.

Thanks.