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Go to Admin settings
Click on Custom Definitions in Data display section
Create custom dimension.
To expand data that will be shown in reports you can use up to 3 event parameters:
event_category
event_label
value
Scope should be Event.
Then you will find these dimensions in reports Engagement → Events.
All TC events has TCW prefix so you can use it to filter events.
And approximately after 24 hours you will see new dimensions