Quick Profile from Surface/ Intersecting Corridors

I am attempting to show the mainline corridor on a sideroad profile so that I am tying into it correctly.  My mainline corridor is referenced in.  What exactly are the steps to show this on the sideroad profile?  When I attempt to select the mainline corridor or any of the features within it I get a notice "Element is in a read-only reference" and it will not allow me to select it.  I know that it is possible.  After multiple attempts and frustration I just start clicking and sometimes it works but I have no idea what I did.

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