Hi Henrik,
Thanks for checking out our plugins!
Event Tickets Plus does not come out of the box with the ability to select other products as add-ons to tickets, but since tickets are essentially WooCommerce simple products, you typically can use WooCommerce add-ons in conjunction with tickets. However, these will not work directly on the event page itself. You can enable the full WooCommerce product page for tickets, which we have more info on here. This will provide a more standard WooCommerce experience with tickets and allow users to select other products on the ticket page (note that this will be separate from the actual event page), provided you are using a third party plugin like one of these that allows you to do this. Event Tickets Plus itself comes with custom fields, but nothing to allow additional product selection.
We do offer full refunds within 30 days of purchase, so feel free to do a test run! If you have any other questions, please don’t hesitate to ask.
Thanks,
Jennifer