Is it possible to change the products based on the local regions without choosing a particular store? So do, I need to make a custom field of location for the products? Please help me!
Mostly depends which attributes You want to change (description / translations / prices?) also depends on what regions (street / cities? depends on geoIP or shipping address?).
Please tell us more about You issue.
Basically you cant do that without store / store view. May be there is some module doing something similar but I know know any.