Create any number of discount codes for buyers.
Discount codes only work for the event under which they were created.
Go to Dashboard
Select your event and click on "Edit"
Select "Discount Codes"
A discount code may include :
Code : Alphanumeric value to be communicated to buyers
% or Amount : The discount may apply a % or a value discount to the transaction
Quantity : Number of times the discount code may be used