Using Custom Templates in WordPress for Efficient Section Duplication

Yep, cool. I use a template that I've built, so it has the sections already – it's more just that when I want to duplicate a section, right now I'm just copying and pasting it. Fine doing that if it's the only obvious way. Wordpress's Patterns are a brilliant 'one click' list of pre-built sections/blocks, but going without them ain't a world-ender!