They are managed by leveraging SD profile to control interaction creation/update/close.
• New in profile corresponds to ‘Create’ catalog request in SRC Support/Service
• Update corresponds to ‘Update’ and ‘Resubmit’ in SRC
• Close in profile corresponds to ‘Close’ in SRC for Support item.
• New in profile corresponds to 'Menu' option of creating requests via Service Catalog in the SM Web Client.
Normally the behavior need to be consistent across portal and web client, which means if one user does not have “New” privilege in SD,
then he cannot create an interaction , no matter through portal (ESS or SRC) or web client.
And in OOB we are following this rule to control the access.
If different access control in SRC and SM web client is needed, it can be achieved through tailoring solution by disabling Service Catalog option (menu) for the Web Client or any other client (i.e. ESS) and would involve condition changes.