Kehar,
You failed to mention what kind of database. Access, MySQL, SQL, Progress, Alpha, Oracle, Fox Pro?
However, for most of those it is as simple as having a lookup table to populate your combo box and to change the table your queries look to. BUT, for some things like triggers, stored proceedures, and such, this will make your job a little harder as you will need to alter those to either accept a parameter or to look up in your lookup table to build their functionality.
So, in short, for us to help you better we will need to know what is your backend.
Good Luck
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