When importing a contact list directly to your event, you can also add Addons to the imported contacts by following these steps:
Click on `Attendees`
Click on `Invite / Import`
Click on `Group`
Check the box `Skip invitation, just add to attendee list`
In addition to choosing which ticket batch the participants should be added to under Ticket batch, you can also select which Addons should come with the ticket.
To add Addons to the imported contacts, go down to Addons and select `Add`
Select the desired Addons from the list
Selected Addons will be displayed with a blue text and a check mark next to the name.