AutoCAD Civil 3D

[#1]

Hi everyone, I have created a corridor with a intersection. Everything is oki so far. But now that I'm going to create surface for each layer in the corridor and select the boundaries. The boundaries under add automaticly will not show up??

Anyone know a solution for this.?
Going to use the surfaces in the volume dashboard to calculate the materials.

[#2]

You often can't use the "add automatically" on complex corridors. You'll need to use add interactively.

[#3]

Oki, so the best thing to do is to create a closed polyline then and use that one?

[#4]

Not really what I said, but sure.