how to load AR transaction with tax line when not tax setup in place

Hi Team,

i want to migrate a AR transaction with tax lines too via fbdi. i can able to load the line with fbdi for tax how to load tax line as i have fixed amount which was calculated in legacy system not we want the same tax amout line should interface as it. but there is not tax setup is defined for fusion tax.

like ebs can we do interface line and tax both a seperate line as per legacy data if not fusion seutp is place please suggest