Restrict access of sales staff for few customer

How we can restrict access of staff for some customer ?
it means staff have access to read and write for all customer except a few customer we chose ?

i check in User Permissions Manager we can allow access to a few customer we chose , but we want user have access to all customer except some customer we don’t want .


Perhaps you can apply User Permission based on other link field in the Customer master like Customer Group, Territory, Currency etc. As per this permission rule, bases on the value in one of these link field, restriction will be applied for the user. You can create a user perimission to define which Customer Group, Territories etc. will be accessible for the user. Rest will be hidden by default.

Thanks so much Umair .