You can delete an existing Company User from within your Reseller Control Panel.
Follow the simple steps mentioned below to do so:
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Login to your Reseller Control Panel. See details 
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In the Menu, point to Settings -> Company Users and click List. This will list the existing Company Users along with the their Role. 
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Click the Name link of the Company User to bring up the Details view for the Company User. 
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Click the Delete button and then confirm the Deletion by clicking OK. 
