There is an additional page in the planning window where it is possible to assign additional areas to a course: e.g. a swimming course might require a quick warm-up before starting to swim. Therefore it is possible to add the extra area where the warm-up will take place and its duration.

Please note that the white Add button (6) is to assign additional areas, while the yellow Add button (7) is to confirm the creation of the course.

This operation can also be carried out after the course has been planned.

Click on Planning -> Courses -> Course Summary, filter by season and by activity and then click on Details (next to the course).

Click on Other Collocations and apply the necessary filters. 

Please note that for this option it will be necessary to edit each course individually.