need tax code help

New tax codes needed in SAP

1st Tax code:

Gross Income perception Buenos Aires: 6% + Gross income perception C.A.B.A: 3.5%

Both of them under the same line.

2nd tax code:

IVA CF 21% + GI Buenos Aires 6% + GI C.A.B.A 3.5%

please lets un know against which tax type i need to update percentages?

please help

Regards,

O.Srilatha