tax city/ state

I am trying to set up RMS to tax customers properly both in the store and for orders taken over the phone and shipped out. I currently have my system set up to charge 6.75% tax to all in store and phone orders in my state (state tax - 5% and city tax 1.75%) Is there a way i can set up 4 steps/tiers to tax by?

1. in store sales 6.75%
2. phone order sales within city 6.75%
3. phone order sales within state but out of city 5%
4. phone order sales out of state 0% tax free

I already have my system set up so it will tax anyone with a instate shipping address but can break it out between #2 and #3 above.

any help out there? Thank you in advance!