MS Excel
You can select a single range of cells by

Clicking the upper-left cell in a group of cells and then pressing the Shift key while clicking the lower right cell in a group of cells
Pressing the Ctrl key while dragging over the desired cells
Pressing the Shift key and an arrow key
Dragging over the desired cells

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MS Excel
To center worksheet titles across a range of cells, you must

Format the cells with the comma style
Select the cells containing the title text plus the range over which the title text is to be centered
Select the cells containing the title text plus the range over which the title text is to be enfettered
Widen the columns

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