There is a feature to designate a control as a map exchange control.
Open the control as you would when you want to define the symbolic description of the control. Just below the symbolic description, select the "Control with map exchange" control type in the pull down list.
Once you have done this, all of the export and printing features (except when printing directly from the course layout editor) will let you choose if you export or print part 1 or part 2 of the course.
An alternative, when the map exchange is not placed at a control, is to insert a new start point into the course, where the map exchange will take place. For this option, you probably want to mark the leg from the previous control -- double click on the leg line and check the "follow streamers on this leg" box.