Most project management systems have methods for dealing with checklists, this is definitely not what slack is designed to do no matter how much they market it as a "productivity tool"

So if you're not using something for project management first you need one of those, but just about everyone does, and once you have one you can start using it's checklist features

Then it depends on what that specific software offers, but even if it doesn't have a true feature for creating "templatized checklists" which I assume people want so they can repeat the same list, most have duplication functionality so you can just create one as a template and duplicate it as needed.