Hello Mark,
SNTC is set up differently and does not offer that feature. The customer is the primary user of the portal and the partner is granted permission to view the customer data. Each customer is unique and their inventory is routed only to their specific company profile in the SNTC portal. So each customer and their installed base data is a one to one relationship, maintaining the necessary data privacy. The Partner Support Service (PSS) portal will do what you need but is only available to PSS partners.
What you could look to do in SNTC would be to set up your unique customers in the SNTC portal and then ask customer to grant you access to see their installed base data. When you log in to the portal you would see all the customers and customer data. Within the portal set up we have the Partner Administrator user role which would allow you to manage the accounts more effectively.
If you are looking to manage the customers within the portal you may be interested in the Partner Smart Assist Service to help you support your customers. You can find the details and supporting material on the Partner Smart Assist Community (https://supportforums.cisco.com/t5/partner-smart-assist/ct-p/13022411-partner-smartassist )
I hope this helps. Regards, Tim
