Setting up Taxes for Multiple Tax Rates within state (Colorado)

[markw10]

I am currently setting up a CRE Loaded web site which is of course os commerce and am having a problem setting up the tax rates. I haven't had much luck on the CRE Loaded forums and since it's oscommerce based I thought someone here may be able to help. Here is the situation I'm in:

 

I live in a suburb of Denver, Co and the way taxes are done here is they vary a lot by location. For example if someone isn't in Colorado I collect no sales taxes. If they are in the state but outside of the Denver metro area in general I collect the flat sales tax rate of 2.9%. Then if they are in the Denver metro depending where they are I have to collection taxes for a stadium tax plus a transporation tax which adds up to around 4.1%. Then if they are in the same county as me they are another .9% of so and then if they are in the same city as me another 3% or so.

Often it is confusing because it's hard to know where the stadium and transportation tax can be. It's not necessarily by city or county in the metro area and some cities if they are in the right area they may be in the same county as me but also could easily not be. I would set up by zip code but some zip codes for example may be in the same county as me, others aren't.

How would I set up something like this?