Multiple corridors, aligning template drops Open Roads

I am using a mainlane corridor with separate frontage road corridors attached when creating my cross sections. I am using the mainlane alignment when running cross sections. Since the frontage roads aren't on the exact same stationing as the mainlanes, they are in-between template drops and are interpolating and not exactly touching existing ground.

Is there a way to add template drops or key stations that correspond with stationing from another alignment to prevent the interpolation? My main concern is for when I run earthwork calcs and the end conditions not connecting to existing ground exactly.

I hope this makes sense.