Hi,
Thanks for using our plugins.
WooCommerce Tickets replies on WooCommerce for coupons and discounts so we do not have any features to do this.
Since tickets are products you maybe could setup a coupon to do this.
Or there maybe to use a plugin such as this Bulk Discount Plugin:
WooCommerce Bulk Discount
That may help you target the ticket products and offer a discount based on how many are being purchased.
Let me know if you have any follow up questions.
Thanks