You can add routines to a show by going to Shows>View All Shows from the sidebar and clicking the green Add Routines button next to the show name.
Search for a group name under "Select Routines" and click Submit to add groups to the show.
Click the green "Sort Routines" button to set the order of groups in the show. Drag and drop the order of the groups.
‼️ Important Reminder: Adding a routine to a show does not assign dancers to that show. You still need to assign the dancers to be in that show. You can do that by adding the individual dancers to the show or assigning dancers from a routine to a show. See the help article on Adding Dancers to a Show.