Customize an existing permission level

If you wants to create custom permission level that is a replica or identical to an existing default permission level and you do not need to use the default permission level, you can customize the default permission level.

To customize an existing permission level

1. Verify that you have one of the following administrative credentials:

·         You are a member of the Administrators group for the site collection.

·         You are a member of the Owners group for the site.

·         You have the Manage Permissions permission.

2. On the Site Settings page, under Users and Permissions, click Site permissions.
3. In the Manage section of the ribbon, click Permission Levels.
4. In the list of permission levels, click the name of the permission level you want to customize.
5. In the list of permissions, select or clear the check boxes to add permissions to or remove permissions from the permission level.
6. Click Submit.

That’s it and you are done J J

If you have any queries/questions regarding the above mentioned information then please let me know. I would be more than happy to help you as well as resolves your issues, Thank you