1. Go to Reports module>Click On Report
2. Click the button 'Add Report' on the top right section
3. Choose Contact as the primary module and Ticket as Related module and click Continue
4. Choose Summary Report as the report type
5. for Columns, refer to the picture below:
Note that you may add/remove any columns that suit your needs.
6. For Grouping choose Contact Name
7. For Criteria, refer the picture below.
8. Proceed to Save the report
Once the report is generated, it will show all ticket that is created by portal users regardless which channel did they create the ticket.