Hi @nemethattila. The surface you want to build can be set up in this way:
Use the feature lines option for data type: You will need to have a code for each point I show you in the following image. If you already have them, just use them. Otherwise, use a mark point with the code of your preference at each of those locations to create the surface.
Rebuild the corridor after adding the mark points (in case you had to do it)
Once you make sure you have the codes, the corridor will create feature lines with those codes so you'll be able to find them in the drop down list when adding this data type to the surface:
It should look like this:
When you are sure you added what you needed, go to the boundaries tab if you consider adding one boundary to the surface will be helpful. Otherwise, just hit OK, and you'll have your surface ready to work.
I hope this helps. Best regards!
Camilo Fernández
Civil engineer | Specialist in design, construction, and maintenance of roadways