You can
w
atch this video to learn it too alternatley you can read this article.

http://www.youtube.com/watch?v=VDwFTSQ-OQA


If you're creating a worksheet that will require user input and you want to minimize data entry errors, use Excel's data validation feature to add a drop-down list. The best part about it is that you don't have to write any macros.

Data validation is an excellent way to ensure that a cell entry is of the proper data type (text, number, or date) and within the proper numeric range. The drop-down list produced with the feature appears when a user clicks the cell.
Here's how to create a drop-down list:
  1. Type the list of valid entries in a single column. If you like, you can hide this column (select Format, Column, Hide).
  2. Select the cell or cells that will display the list of entries.
  3. Choose Data, Validation, and select the Settings tab.
  4. From the Allow drop-down list, select List.
  5. In the Source box, enter a range address or a reference to the items that you entered in step 1.
  6. Make sure the 'In-cell dropdown' box is selected.
  7. Click OK.
If your list is short, you can skip step 1 and type the list entries directly in the Source box in step 5, separating items with a comma.
The Data Validation dialog box has two other tabs. Click Input Message to add a prompt that will appear when a user selects a cell. Click Error Alert to specify a custom error message if the user's entry is invalid.
The handy data validation feature suffers from one serious flaw. If you paste an entry into a cell that uses data validation, the validation isn't performed. And if you select that cell again, the drop-down list no longer appears. Fortunately, you can circumvent this problem by protecting the worksheet: Select Tools, Protection, Protect Sheet.
Alternately you can
w
atch this video to learn it

http://www.youtube.com/watch?v=VDwFTSQ-OQA

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