It´s often a good practice to divide you corridor design into parts of the alignment, it´s faster to work and in revision faces you can pinpoint the part your interested in without worrying about messing up the rest.
The first need is to create alignment and profile in separated files from the corridor, that's covered.
Next step is that you want the same assemblies in alot of corridor files, this is a manual copy process that is time consuming.
I would like the possibility to DREF assemblies.
With that you could build a master assembly file for your project and dref the assemblies out to the corridor files.
Best regard /Magnus