Hi there, ruiganga!
We have a Location feature in QBO, where you can tag locations on your sales to know which area they are for. This feature will also let you create reports per location. For example, Sales by Location and Proft and Loss by Location. However, all your clients' list are just in one company file, you just have different reports.
See about Location tracking. This article also talks about class tracking. You can try this feature on our test account.
Let me know if you need anything else.
