Practice Exercise 11: Customize a table by applying formulas
STEP 2: Entering the formula:
In cell D2 enter: =C2B2 and press Enter (FIGURE 2). The power of entering a formula into a table is that you only need to enter 1 formula. When you press Enter to execute the formula, the entire column is calculated, as shown in FIGURE 3. This will occur when entering a formula into any cell in Column D. You can edit the formula using any cell. And the editing results will propagate to all of the other cells in the column automatically. 
FIGURE 2
FIGURE 3

STEP 3: Smart Tag Information: This symbol that appears next to a table formula results, is known as a Smart tag. When you click on it, an arrowhead shows, which when clicked on, provides a dropdown menu.
Click on the Smart tag symbol with the mouse. Click on the arrow to see the dropdown menu (FIGURE 4). Drop down menu options include undoing the calculation, stop automatically calculating the formula results for that column. Selecting the Control AutoCorrect Options takes you to the AutoCorrect dialog box; selecting the More Actions button takes you to helpful info, which gives other choices. 
FIGURE 4

This is the end of this section. To continue, go to Module 2 Section 2.5 Sorting a Table – Using a Custom Sort to Sort a Table; Practice Exercise 12