Doodad - Structure Pathing

[Clayart97]

Hey I'm new to the world editor. Right now I am starting a campaign, but I am having trouble with one of my structures. It is a Pier, and I'd like my units to be able to walk on it (it's over the water), but I can't figure out how to do it (I already made a custom doodad out of it). If someone could let me in on a bit of advice, I'd be very appreciative!

 

[Wietlol]

You can always use invisible platforms.
Place one of those at the same place as where you want your units to walk.
Then select it and press "ctrl + pgup" until the bottom of that platform is exactly the same height as the pier.
Do that for the complete pier.

(first place all platforms and then raise/lower their height.)