You can go to follwing webpage.
Click on Customer tab.
The image shows a sales rep with no customers before the transfer.
Click on Customers Menu > Customers > New report.
Select the field that you want to use to narrow your search.
Click on the result tab to be able to view the new list of customers to assign.
Click on the summary tab to view a summary of the changes to make.
Select the sales rep you want to assign routes to and click on update once selected.
Now you can see the results.