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.

The sales managers should use Maps Advanced and create logical visit plans to ensure a logical routing structure for door to door sales and cover all houses on one street before moving to the next. Maps Advanced allows users to create visit plans based on various criteria, such as frequency, priority, location, and availability. Users can also use logical visit plans, which are a type of visit plan that assigns visits based on proximity and order. This can help users visit all the houses on one street before moving to the next, and reduce travel time and distance. This is explained in the Create a Logical Visit Plan document.

Explanation
According to the Salesforce Help article on Understand and Troubleshoot Unit Assignment in Salesforce Maps Territory Planning5, two steps that a consultant can take to troubleshoot the issue of no units assigned to areas are: edit the data set, and see what field was used for Unit Assignment, and create a new alignment, and use the correct matching logic for this field; and edit the data set, and what report and/or queries were used to create it, and double check that the reports and/or queries return records when logged in as the OAuth user5. These steps will help ensure that the data set has valid unit assignment values and that there are no issues with data access or permissions5.

Analyze and Compare is a feature that can be used to view proposed changes before reassigning in Territory Planning. This feature allows users to compare different scenarios of territory alignment and see the impact of their changes on key metrics such as annual revenue, unit count, and workload balance. This feature can help users make informed decisions and optimize their territories for sales and service performance. This feature is explained in the Create an Optimal Territory Alignment document.