How do you lock a cell in a formula

Excel tip:

Switch on smart tags – Excel 2007

In order to use smart tags, make sure they are turned on, to do this:
1. Click on ‘Microsoft Office‘ button and then click on ‘Excel Options‘.
2. Click on ‘Proofing‘ category and then click on ‘Auto Correct Options‘.
3. In the ‘Auto Correct‘ dialogue box appears, click the ‘Smart Tags‘ Tab.
4. Tick the boxes, next to the Smart Tags you wish to use in Excel

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