Often an event host is looking to provide complimentary (comp) or discounted tickets to sponsors. We have different ways in which this can be done. Reach out if you have more specific needs not listed below.
If you would like sponsors to select their own tickets, then you can send them to your ticket sales page and give them a "comp" promo code. You can create the code to be for any ticket to any event or to a particular ticket type for a particular event and many options in between. More info about options for your promotion codes is here: Create a Promo Code
If you would like to hand select the tickets for your sponsors and send them via email, then you can process the order from your admin "Add Order" page. When you checkout you will enter a name and email and select "Comp" at the payment page. More info here (see step 10): Process an Order.