Otherwise it’s customizing in buy-buttons.liquid snippet, or other advanced theme customizations.
If you need this customization for your business logic then contact me for services.
Contact info in forum signature.
ALWAYS please provide context, examples: store url, theme name, post url(s) , or any further detail in ALL correspondence.
@DB19 Curious - any reason why you wouldn’t want to use a preorder app to do this?
It’s a lot faster and easier to do it, and you can avoid any pain in updating your theme versions (customizations don’t carry over). We run a Preorder & Back in stock alerts app - STOQ - and it’s super easy to set things up with us. Happy to help you out end-to-end if you’d like!