Q: How do I credit Tax Only for Specific Invoice Line in AR Invoice,

I have a requirement from client as follows,

An AR Invoice with Multiple Lines with different Ship To Locations on Each Line, Tax is calculated based on different ship to's on each Invoice line, Now customer came back hey I am Tax exempt in this ship to location, so you shouldn't charge tax for these specific lines where tax is exempt.

How do i process a credit or dispute for this type of situation where customer is requested to Credit Tax Only for Specific Lines (not Specific Line Amounts)?

Appreciate your response at the earliest.