If you have multiple sites loaded to your user name you can check all of them at once and compare sites against each other when you click on the 'Reports' module.
The first page is an overview of all sites and can looked at over a day,week or month time period.
We have other Multi site reporting tools located in the widget menu on the left.
Total Sales which can be viewed over a day, week or month.
Discount Report from all venues.
Actual Sales vs Budgeted Sales
Wage Cost and percentage vs Total sales