Go to Organiser control Panel – Events – Edit Events – Attendee Registration form, you can see the default 8 fields with the values.
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If You need to add more fields, click PLUS icon, Enter the Field Name, Label, Type, Is the field is mandatory or not and Submit.
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You can select the Field type as Multi select drop down and you enter the drop-down values in default values menu and submit.
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You can select the Field type as File and make you customer to upload the file or documents.
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After create the fields, you can able to rearrange the Display Order Form for form fields.
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Now go to your event landing page, open your Attendee Registration form and you see the extra fields added are displayed in attendee registration form.
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