State Tax import question re: "Tax Type"

I want NS to use the tax table for California, and want to import the rates.

1. I go to tax setup to import state tax rates (Setup > Accounting > Use State Sales Tax Tables)

2. I choose the state I want to import the tax rates for (California in my case)

3. I am presented with a list with the following headers: Tax Type, Tax Agency and Tax Account

4. Under "Tax Type", there are 8 entries:
  State
  Transit
  County
  City
  Other 1 Sales Tax
  Other 2 Sales Tax
  Other 3 Sales Tax
  Other 4 Sales Tax

My question is: what are these 8 tax types for? I only want to charge a sales tax based on the city/state combination. I cannot ignore the Tax Types I don't need, I have to select an entry under "Tax Agency" and "Tax Account" for each "Tax Type" to be able to click "Save"