Hey Lis,
I’m not sure how your Groups Pricing add-on for WooCommerce works, but yes, Tickets created by our Events Calendar WooCommerce Tickets add-on are created as basic “Products” within WooCommerce.
Each ticket is created as a Product, not the event itself.
There unfortunately may be an incompatibility with these plugins – Tickets are saved as WooCommerce Products, so if things are configured correctly and the Group Pricing add-on works fine with WooCommerce Products at checkout, there shouldn’t be a problem in theory.
Your best bet here is to contact the support for the Group Pricing add-on.
In the meantime, you might find luck with default WooCommerce Coupon Codes. These work fine on tickets at checkout and, though a bit more laborious, perhaps you can get something working in place on your site by making coupon codes for each group for now.
Let me know what you think!
George