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Fortunately, Excel can organize data in groups, allowing you to easily show and hide different sections of your worksheet. You can also summarize different groups using the Subtotal command and create an outline for your worksheet.Select the rows or columns you want to group.The Subtotal command allows you to automatically create groups and use common functions like SUM, COUNT, and AVERAGE to help summarize your data.For example, the Subtotal command could help to calculate the cost of office supplies by type from a large inventory order.                                                                                                      Your data must be correctly sorted before using the Subtotal command,When you create subtotals, your worksheet it is divided into different levels. You can switch between these levels to quickly control how much information is displayed in the worksheet by clicking the Level buttons 1,2,3. to the left of the worksheet.Click the lowest level to display the least detail

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A simple formula is a mathematical expression with one operator, such as 7+9.A complex formula has more than one mathematical operator, such as 5+2*8In order to use Excel to calculate complex formulas, you will need to understand the order of operationsExcel calculates formulas based on the following order of operations:

1. Operations enclosed in 2parenthesesExponential calculations (3^2, for example)3Multiplication and division, whichever comes first4Addition and subtraction, whichever comes first.A mnemonic that can help you remember the order is PEMDAS, or Please Excuse My Dear Aunt Sally.                                                                          In our example below, we will use cell references along with numerical values to create a complex formula that will calculate the total cost for a catering invoice.The formula will calculate the cost for each menu item and then add those values together.Select the cell that will contain the formula