Offering Different Services on Different Postcode Areas
You may not wish to travel long distances for "routine" or lower cost services, but may be happy to offer some more profitable services on a wider range of postcode areas.
To do this, you will need to set up an additional office in your account which will offer those services - it is perhaps easiest to visualise your offices as concentric rings: an "inner" office that provides all your services to your immediate postcodes, and an "outer" office covering a geographically larger selection of postcode areas that only offers the more profitable services that you are happy to travel larger distances to provide.