Blanket Fees, also known as Day Fees can be set up by selecting the Blanket/Day Fee from the Data menu...
To the left is a simple list editor, your first step in setting up a blanket/day is to add an item to this list and edit the name to suit. Then it's a matter of selecting the options and selecting which classes will be involved.
You can set the trigger to be either the number of classes entered or a certain amount in class fees. When the condition is satisfied the blanket/day fee will be charged and the individual class fees for the classes involved in the fee will go to zero.
In this show sub shows are being employed and sub show 1 is currently selected. You can assign classes from each sub show to a fee specific to the sub show or assign classes from multiple sub shows to the same fee.
The rest of the parameters should be self explanitory.
Note: To get a Day Fee effect you may have to create fees for each day of your show in each category selecting in the approriate classes for each.