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Our client is using flat rate delivery charges for things like standard 9-5 delivery or Pre-10am, or to ship to the Channel Islands which are all separate costs, they have around 10 of these different charges to select from which is already quite a lot. They require a separate option on that page in the form of a checkbox which allows the user to select "Saturday Delivery". The idea behind this being, that it should ADD a fee of £12.00 to any of the other delivery options already listed with one selected. The only way I can see to do this right now, would be to add another 10 flat rate options into the system all with the £12 added in, which would make the total number of delivery options quite large, so I am hoping as this is a special case of delivery that there is a way to add an additional form element and use rules to calculate the new costs?