When using Excel 2010, or earlier versions, there are many times you want to select nonadjacent cells to build a formula or to format individual cells on the worksheet. There are a number of keyboard techniques that allow you numerous options for selecting any cells you want without deselecting cells you have previously selected. Excel has a built-in feature called "Add to Selection" that can be turned on and off with a keyboard shortcut.
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Add one cell at a time to previously selected cells, without deselecting any of these previously selected cells, by pressing and holding "Ctrl" while you use the left mouse button to add new cells.
Add a range of cells to previously selected cells without deselecting any of these previously selected cells by pressing and holding "Shift" while you drag the left mouse button to add a new range of cells.
Add more cells to an existing selection of cells by turning on the "Add to Selection" feature by pressing "Shift"+"F8," and then using your mouse to select any nonadjacent cells.
Turn off this "Add to Selection" feature by pressing "Shift"+"F8" a second time, and Excel will revert to the default cell selection technique.