Using a Course for a multisport activity

Hi.  I primarily use my Forerunner 645.  However, when I sent it for repairs at one point, I got a good deal on a used 735xl to use for a few weeks, and soon I'll give it to my daughter.  In the meanwhile, I'm planning on doing the Marine Corps Marathon Virtual Duathlon (5k Run, 20.4k Ride, 5K Run).  I picked out a route around my neighborhood, but wanted to see if I can do this as a course, with the route showing on the 735.  When I use the course creation on Connect, I can only pick bicycle or running.  Would a Course work in the multisport mode?  Which type of course should I select, "Other?"   I tried searching the manual, but didn't see anything covering this topic.  Thanks for any information.