Import service and hotel quarantine

Indian importer has placed a service PO on USA Co for commissioning. Besides technician fees based on per diem rate, they will charge a lumpsum amount towards 14 days quarantine at Hotel ..Covid guideline. Not at actual. How to apply withholding taxation on two different line items,,one is defined on days of work basis and another lumpsum without any service..plus if quarantine bill at actual, will it be different tax rate? 

Please guide.

Jayanta

Kolkata

2.9.21