as per above image Line 1 = Line 2+ line 3 + line item 4 the requirement is Line 1 = line 3 + line item 4 but Line item 2 need to post into relevant tax GL

when doing bill posting using vf01/vf02 tax are posting to the customer GL but in this scenario business need only posting for relevant company G/L not for the customer G/L this image I took from VF03-->Accounting -->accounting document 

as per above imageLine 1 = Line 2+ line 3 + line item 4the requirement is Line 1 =  line 3 + line item 4but Line item 2 need to post into relevant tax GL