Dropdown Boxes to take users to relevant sub-forums?

[mg777]

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Hi,The forum that I intend on designing will have many hundreds of sub-forums - eg. The will be a forum for all countries, then sub-forums for all states, then sub-forums for all cities, etc... which will mean that if a user wants to go directly to a particular city, they will need to choose the country, then state, then city - to view all the relevant threads.

Are there any tools/plugins for VBulletin which would allow me to place dropdown boxes at the top of the main page which would allow users to quickly scroll the dropdown boxes to find their relevant country, state, city and then be taken directly to the particular sub-forum - as this will save the user a lot of time?
Please supply links and examples if possible.
Thanks