Need to restrict users to see their own customers

we are having a little trouble understanding the users role and permissions.

we have created some users and assign them a role of Sales Master Manager. now we want each user has access to their own customers and hide other users customers. kindly explain how can we achieve this.

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You mean user can only see customers created by themself? If so, check if owner customer doctype inside sales manager role

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ok its working perfectly fine. only one issue … the rule is applied for the newly created customers but previously created customers can be seen by other users … is there any way to work around and save time by re-entering the all the customers data