To set their office address as the default start and end location for new Routes within Salesforce Maps, a Sales Rep can follow these steps1:
From the Maps interface, click on the Settings gear icon at the top right corner of the navigation bar.
Select Routes & Schedule from the navigation sidebar on the left to open the Routes and Schedule settings menu.
Under General, select an existing Favorite Location as the default start and end location. If the office address is not already a Favorite Location, the Sales Rep can create one by following these steps2:
Plot the office location on the map using a marker layer, a data layer, or a POI search.
Click on the office location marker to open the Details tab.
Click on Add to Favorites in the Actions tab.
Enter a name for the Favorite Location and click Save.
Click Save to save the default settings.