I do not agree with the conclusion that your client does not have to pay Indiana state tax.  I suggest you research that further.   

To get the county tax to flow to the Indiana return.... enter the W2 as received  - do not remove any amounts as you said you have tried.    Be sure to enter the Associated State  next to box 19 on the W2 worksheet.   You also need to complete the Non resident section of the Federal Information Worksheet it is Part XI in the Professional Proseries - not sure about Basic.