How to create a Destination area

Below an example with the Travel distance overlay based on a school and pedestrian traffic.

How to create a Destination area:

Have a project loaded in the editor and decide the area of interest of the Travel Distance overlay, a school in our case.
Add an area and select to Adjust the area.
Draw in the area around the school. Important: Ensure that the area overlaps the adjacent roads. In our example the area overlaps with roads east, west and south of the school.
Apply the selection.
Select its attribute tab on the Detail Panel.
Under Add New Attribute, write the name of the Destination area attribute; for example ROUTING_AREA, and set its value to 1.
Save the new attribute.
Optionally adjust the area color; it will be used for the resulting overlay
Open the Travel Distance Overlay and select the keys tab. Under the key Destination Area, select the attribute chosen attribute in step 3, in the example ROUTING_AREA. This ensures that the destination areas are identified using this attribute.

School selected as example, the blue arrow is added for clarity
Please note that the area overlaps all adjacent roads east, west and south of the school
Added the attribute ROUTING_AREA to the Area.
Setting the key for Destination Area to ROUTING_AREA.