1. From Setup, enter Custom Permissions in the Quick Find box, then select Custom Permissions.
2. Create or select an existing custom permission.
3. In the Required Custom Permissions related list, click Edit.
4. Select the custom permissions that you want to add from the Available Custom Permissions list, and then click Add, or select the custom permissions that you want to remove from the Required Custom Permissions list, and then clickRemove.
5. Click Save.