Cross-listed courses should already be automatically combined into one course site. The course site will be numbered according to whatever the "parent" course is in Jenzabar/myDU. Be sure to alert your students to this, as well! They may wonder why they are seeing the "wrong" course listed. If you click on the People menu item on the left, you should see ALL students from each individual course enrollment that you see in the official myDU course roster.