Go into Striven and open up Stock entry

In the Stock entry window ,Select the Landed Cost Table

In the Landed cost table window you will need to select F5 NEW and name it according to what you would like it to be.

Click in the bottom and Press F10 Add line.

You need to go into the Cost code and select either $ or % amount

Once selected you will get the next window:

Using the % as an example

Press F9 Save afterwards

Once completed apply the Landed cost table via F2

Next go onto the costs tab and put in a % or $ amount to the freight.

Press F9 Save

You can then go back tot he Quick entry tab and the cost should change.