The only way to do this is to use a 'Component' on that particular product.
Highlight the product in question and right click, selecting 'New Component' and calling it something like 'Inc. Handling Charge'.
Open the product that the charge is attached to, and change the 'Pricing Model' to 'Sum of Product and Components Prices' then open the component.
For the field 'HTML for Name:' put something like 'Handling Charge - £2:00' (or whatever the cost would be).
Enter the required price in the 'Price' field
Uncheck the box 'Is Optional'.
When uploaded this will show the item as having an additional charge.
PLEASE NOTE: This is only relevant for v7 and earlier software as from version 8 onwards it is possible to add a shipping supplement for each product
Highlight the product in question and right click, selecting 'New Component' and calling it something like 'Inc. Handling Charge'.
Open the product that the charge is attached to, and change the 'Pricing Model' to 'Sum of Product and Components Prices' then open the component.
For the field 'HTML for Name:' put something like 'Handling Charge - £2:00' (or whatever the cost would be).
Enter the required price in the 'Price' field
Uncheck the box 'Is Optional'.
When uploaded this will show the item as having an additional charge.
PLEASE NOTE: This is only relevant for v7 and earlier software as from version 8 onwards it is possible to add a shipping supplement for each product