The latter is more dynamic, but requires more code and a database.
For this example, we'll stick with the simpler solution and hard-code the items.
In most cases, you access the property settings by double-clicking the control.
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For example, if you had a “Status” column in a spreadsheet keeping track of your various projects for your multiple clients, you could limit the valid entries for that column to “Completed,” “In Progress,” “Cancelled,” etc., etc.
In this way, you make your Google Docs spreadsheet more user-friendly (: This video is pretty out of date, but it will give you the overall idea of how validation works in Google Docs.
Many templates and web forms use Word form fields to solicit information from the user.
Occasionally, the selection in one field determines the contents of another.