Related Youtube video : Matukio Tutorial #4 - Payment, Different Fees, Coupons, Taxes and Payment
Here you can create and manage the global different fees - you can also override them for in the event edit (Tab overrides).
A different fee is always calculated in dependence of the normal event fee, e.g. if you event fee is $ 100 and you set up a discounted children ticket with a value of 20 %, the event fee for the children will be $ 80. You can not only setup discount fees but also additions (for example if you want to offer an optional lunch with your event you set up an additional non perceptual different fee with discount -> No and just insert the lunch price as value).