Multipe Tax Rates Under 1 Rule

[steves]

We are using Prestashop 1.6 and I are looking to have different tax rates based on the county/zip code of the shipping address.  Under Taxes I created Palm Beach County and assigned the 6.0% sales tax.  I then went in under tax rules and added the zip code range of 33401-33422 to that County by selecting united states/florida/palm beach county

 

I need to add more zip codes to that same county and clicking on add new tax rule tells me one already exists for that country/state with tax only behavior.  How can I add more zip codes to the Palm Beach County section without creating a new one (Palm Beach County 2) and assign a zip code there?

 

Once a tax rule has been added, I see the first one at the bottom and the bulk actions drop down has a select all/deselct all option, well if I can select more then one how can I add more then one rule to this list?

 

Thank You