How do I save adapted templates

I’m using Local by Flywheel to play around with and learn WordPress with a view to switching from my Dreamweaver created sites.
I’ve imported some templates which have sections of pages I like and I’ve edited them to add my own content and adapted layout.
How to I save these adapted templates with a new name?
I can see ‘add new’ and ‘import’ but no ‘save as’ type button
Will they then appear in the list of ‘my templates’ along with the ones I’ve imported?

Which WP screen are you looking at when you’re referring to the Add New and Import buttons?