Custom Admin Menus

Hello all,

I was wondering if there’s a way to add custom menus to the admin side.

For instance, there’s already Posts, Pages, etc. But I was wondering how I could add a section such as Products and Testimonials? From that, is it possible to have different content within each of these to keep things tidy and not too confusing for a client? So we would have blog posts In Posts, testimonials in Testimonials, etc.

I hope this makes sense.

All the best,
James