Summary reports allow you sum up sales dollars and quantities based on data points such as codes, descriptions, locations, really any field that is not a dollar or quantity amount.

These summary reports streamline the steps you'd have to take in their sibling reports where you have to select Use Totals for every column then design the sorts and groupings for the columns you'd like to see summarized.

These new summary reports also present the data in a much cleaner report.

If you are running a Totals report, look to find if there is a Summary report you can use instead. The presentation of the data will be much cleaner and they are simpler to product.

You can find Summary reports under Reports > Reports

Receiving > Receiving Summary Report

Sales Analysis > Cost Profit Summary
Will summarize products, pulling all of the same like columns such as dept cat, accounting category and / or industry.  

Sales Analysis > Cost Profit Compare Summary
Compare two date ranges in summary mode.

Customer > Customer Sales Summary Report
Pick report sales by either Total Dollars Spent (All taxes, services, products) or just display only dollars spent on products.