Fee Module: multiple fees not possible?

Hi,

I'm setting up a website for my student society and I was hoping to use the fee module for an event that we're running.

The event has it's own website.

However, I need to offer multiple levels of registration, ie $20 for seats A, $15 for seats B etc but I can't seem to be able to do this.

The Fee module page (http://drupal.org/project/fee) says: "There can be more than one level of fees, each with a different amount and different description."

However I can't find this anywhere in the administration section of the Fee module. It only allows one fee as far as I can see.....

I've searched far and wide for this on these forums, I'm sorry if I'm missing something here.

Thankyou for your help!