You should be able to do so already, without RBAC.
Go to the Switchport that you want your employee to be able to manage and tag it e.g. Facility.
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Notice the tag Facility in the screen shot.
Then go to Network-wide -> Configure -> General
Under port management privileges you can configure the tag to be used for port privileges.
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Then on Organization -> Administrators, you can create your employee as an administrator and target the employee to a network and select the tag Faclility.
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From then on, your employee should only be able to access ports only assiged Facility tag.
Maybe he can view other ports - I can't remember. But he will not be able to edit ports that are not assigned the Facility tag.
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