Thanks for emailing support and considering our products.
Addons are not currently part of the plugin. If you are using woocommerce, you can look into addon plugins that will give the attendee more options with price increases when they go to checkout.
Hey there! This thread has been pretty quiet for the last three weeks, so we’re going to go ahead and close it to avoid confusion with other topics. If you’re still looking for help with this, please do open a new thread, reference this one and we’d be more than happy to continue the conversation over there.