I just reread my previous post and I didn't quite explain it correctly. I guess what I am trying to do is to apply a city tax to only part of a zone.
For instance, (and this is NOT how WI does sales tax!! Its only an example..) I set up each county in Wisconsin as a zone, ie Wisconsin Dane Co., Wisconsin Rock Co. etc. then I set each zone's corresponding county sales tax.
So all of Dane county charges 5%, but the city of Madison charges an additional .5%. So this mod will apply an additional .5% to any order shipped to Madison (but not any other city in Dane Co.). Does that make sense? This way I can force the user to select their county, and apply the necessary county tax, and then add on whatever city tax there might be for a specific city only (or even zipcode). Unless I am mistaken there is no current way in ZenCart to accomplish this.
The truth is this isn't for WI its for Texas and California, which have separate municipal taxes tacked onto specific cities within the counties.
I do believe I have this working the way I want, and I will post the file if anyone wishes, but the file is only one part of how this works and I am still developing it so it may not make much sense on its own.
Thanks again for the assistance
LadyHLG