How to Create Report Type for Custom Registrant Fields
Step 1: Go to Setup Menu
Click on the Gear Icon and click on Setup
Step 2: Search Report Types
Search for Report Types in the Quick find box.
Step 3: Create Report Types
Click on the New Custom Report Type Button
Please select the Event Registrant as Primary Object.
Click on the Save Button.
Step 4: Add “Custom Form Fields”
Click on “Edit Layout”
Add the required “Form Fields” and click Save.
Please Note - Everytime you Add a New Custom Form Field for the Event Registration, you need to Update the Report Type also.