In the disposition, you can schedule shipments that have been entered for tours. Tour planning is possible across departments.

Shipments can only be dragged into a tour if they have a disposition release.

There is a green dot in front of it.

Dispatch releases are granted by releasing the tour that precedes the shipment.

From the disposition page: Tour information about shipments on the tour

This section shows the routes that are on the marked tour.
The interaction is very similar to that in the area of shipments / sections.