If I understand correctly you want to split the alignments (horizonal and vertical) that are referenced by a single corridor. If that is the case, I think you will need to separate your corridor as well. How I would go about the actual splitting of the alignments is probably very dependent on how they were generated. I would probably duplicate the alignment file and trim the horizontal. In the vertical I would probably drop the profile, delete the unneeded portions and re-complex/set active. From there I would likely export and reimport those to have clean files/content. For the corridors, depending on complexity, I would again duplicate that file and use the Corridor Reattach command to link the two new corridors back to the respective geometry. 

Steve

Thanks for your support

Thanks for your support