In the import wizard, make sure the Route number column is changed to “Grouping” and ignore the column that shows the stops sequence.
If you have a start address, check the box that says “Set First as start address”.
Grouping routes
Click Next to GOALS tab. You’ll get a notice about gray addresses – Ignore that because these are the start addresses of the other routes.
When you get to the Goals section, leave all settings as default, except the Optimization Goal – Change this to Keep Order As Is.
Change to Keep order as is
Plan your route.
This should keep the order of your routes, without changing the stop sequences on the routes.