Barlines and Ossias

Hello, I was wondering how to make a specific barline connecting an initial part to its respective ossia (alternative) part. I've attached an example image of what I would like to do. You will see that there is a dotted line connecting the two parts. If anyone has straightforward instructions on how to accomplish this, that would be great. I'll attach a sample .mscz file too in case anyone is wondering if I made the Ossia part properly as well.