Events+ Adding Extra Registration Fees

Hello WPMU guru's!

I'm trying to set up a site with Events+. It is for a private hosted event that is every year. The plugin seems to fit most of the needs of the event.

What I'm trying to figure out is how to add extra fees to the registration.

Example: Base fee is $125
Addons:
T-shirt: $10 extra
VIP Seat: $20 extra

So, if a person wants the t-shirt, their final fee for the event would be $135.

Is this possible to do? Hope someone can point me in the right direction.

As always, thanks for your great support!