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How to add a drop down box in excel 2007 
Open the spreadsheet in which you want to add the drop-down box (es). 
Create a list of the items to appear in the drop-down list. 
Type the data in the order it will be displayed in the list.

Options are:
 -- This will give you a starting point on which items to click on next. Select from the options below the column information column that takes up the top half of the page and highlight it, giving it a 90 degree angle.
 -- If all the items are displayed, then the drop-down box labels need to be changed to the correct list. Copy the data from that list (es).
 -- Change the number of tabs in the right column to incorporate further data in each box (es). Change the number of controls in the left column to the five tabs in the left column.
 -- The entries should be typed in a single column or row and should not contain any blank cells. To create the list of the desired items on a separate worksheet, click the tab of the worksheet in which to enter the data.
The entries should be typed in a single column or row and should not contain any blank cells. To create the list of the desired items on a separate worksheet, click the tab of the worksheet in which to enter the data.