I want to limit the access of customer database for a user(seller).

For example, a customer is assigned into a group and the access right of different customer groups for user is allowed by the administrator.
And the administrator has access at all groups.
A user has just the possibility to show, make quote, etc. for customers if he has the access right of the group of this customer.

This is possible in Odoo ? Or it's necessary to develop a module to implement this functionality.

Thanking you for your answer.

BD

PS : I use Odoo 10 Community