hello 
so i created a ramp on my map, connecting 2 mountains…
at the bottom i created a hole using the “visibility” tool…now i have on both side a hole…
and now im stuck…any help here pls
i just want to make it walkable, so you can go from one end to the other
btw: how to take screenshots in ADK?
can you post a screenshot here so I can take a look…and if possible give a BIT more detail on the now what?
you have to get rid of that hole if you want to walk across…the holes are used to make things like caves and what not…clearly that’s not what you are shooting for here…or I just misread your post.
TAKE SCREENS:
Press the PrtScn button on your keyboard. BAM…screenshot is taken…you can either paste it into photoshop or in Microsoft word. and then repost it here.
you can only walk from end to end if there is land…no land…character has nothing to walk on.
Might I suggest http://puush.me/ for screenshots.
You now have 2 holes which will form the entrance and exit of your tunnel, you now have 2 choices create a new 1x1 landscape and place it there acting as the floor or you can build a tunnel using the various rock assets you have, Be sure to set collision to block all if you are using the rocks 
If by layer you mean landscape then yes, the ways i described to you is the only way to make caves and tunnels
