Vat transportation cost

Hello There,

We have to calculate VAT on transportation price. I follow set up below steps.

1). Adjustment name for transportation cost say TRAN.

2). Adjustment name for vat on transportation cost say VTRAN

3). Above adjustment name defined to adjustment schedule TRSCHED

4). Set up Price definition for transport cost (TRAN) 400 with BC code 5 (Add on amount)

5). By above TRAN set up transportation cost added to sales price 2000 (sales price) + 400 = 2400. sales price is 2000

6). Now I want to calculate Vat 15% on transportation cost (400).

7). I unable to set up calculate 15% Vat on transportation.

8). I provide variable option but it very complexity and user not ready for duplication of work.