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In the previous section, the data validation formula was designed to prevent selections from the first drop down, if the cell to the right contained data.

Another option is to use a macro, to clear the dependent cell, after making a selecting in the first drop down. In this example, column B contains a drop down list of Regions.

When navigating or downloading pirated software, IDC developed system performance issues more than 25% of the time.

Their testers estimated that more than half the time, either the virtual PCs crashed or the system slowed to the point that it was unusable.

After you select a Region, the drop down list in column C shows the customers in the selected region.