WSS portal content filtering includes 'CASB application' as an option for destination in the policy. How to get the same list of applications when the WSS policy is managed from the Management Center?
WSS tenant managing policies from the Management Center
To make use of all the CASB applications, make sure you have the add-on subscription “Advanced CASB Application Security” on the referenced ProxySG.
This can be verified from the referenced ProxySG Management Console by going to Maintenance > Licensing > Subscription.
With the Advanced CASB Application Security subscription, you could create rules with the same list of 'CASB applications' available on the WSS portal.