How to combine several corridors to one new surface?

[Anonymous]

The issue is that I have made CAD 3D file with several roads of some district, each road with different baseline, profile and assembly, I need to create one surface of all those corridors so I can use for obtaining levels for other underground utilities design without the need to open this huge file every time I need to check a level.
A surface like that shall be easy to manage in separate file as an ordinary surface if possible.

[Dexterel · Accepted solution]

Crate a new surface for final ground (FG)

Past all your corridor surfaces into FG surface.

Note the order matters. For example you can past first the EG (existing ground) and on top of this add your corridor surfaces.

[Dexterel · Accepted solution]

You can create a master DWG with all corridors by data shortcuts and create your FG in this DWG. And also by data shortcut use this FG in other dwg. Note you need to open the master DWG and rebuild your FG if corridors change.

[Jeew-m · Accepted solution]

Dear Friend,

In addition to the Dexterel comments I would suggest to create a separate drawing for the combined surface.

Data referenced surface may do it better. Otherwise if there are any changes in the corridor you may need to reinsert the surface time and time again.

https://www.youtube.com/watch?v=7jdp02CD2H4

https://www.youtube.com/watch?v=6dbcMTbj7-U

Thanks

[Anonymous]

Thank you friends, all answers are fruitful and to the goal. I managed to export each road corridor as xml file, then in a new file , I export them with command "landxmlin" then after importing all, I created one new surface and in its definition...edit ,I pasted surfaces I have one by one. Finally I exported this single surface as xml file as well. In a final new file, I imported this surface combining all and that's it.
The suggestion given by Jeewana sounds great, but right now I don't have time to study the attached videos, but surely soon I will.
Thanks again for all of you for valuable replies.