Here are the two short videos for Limited Use Smart Account:
1) Video 1: This video provides an overview of the Limited Use Smart Account and the steps to create a Limited Use Smart Account.
For quick reference guide, refer:
https://community.cisco.com/t5/smart-licensing-enterprise/limited-use-smart-account-for-smb-qrg/ta-p/3930370
For detailed instructions, refer:
https://community.cisco.com/t5/smart-licensing-enterprise/cisco-software-limited-use-smart-account-for-small-medium/ta-p/3651342
2) Video 2: This video provides the steps to update a Limited Use Smart Account to standard Smart Account.