I can see that there are 4 boxes when you enter a map.

How do you use more than one waystone when entering?

I've tried using ones of the same tier and of rare/magic quality but the button is greyed out to enter.

You can enter 1 one stone each map only.

Then why did they bother creating 4 spaces where you place the waystone?

I mean there must be some type of usage for them,- otherwise why not just make one box for one waystone?

Keep in mind you aren't playing the full game yet.

Right. I didn't even think of that lol, thanks for reminding me. Maybe they'll add something for it in the future