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Set up a Product Category in the Non Stock Products area. If you choose to break up your revenue to account for Pre Ordered Products Redeemed you can set up a different general ledger account and assign it to this product category otherwise leave all the general ledger accounts blank.

The credit redemption product needs to be set up as a type = PreorderProduct
The product that is preordered can be any product

Set up a product to be used in the redemption credit lines generated by the pre ordered contract call it PreOrderProduct with maybe a description = Preordered Product Credit
Ensure the product has a Type = Pre Order Charge
Assign it to the Non Stock Product Category - Pre Ordered Product Redeemed
You can only have 1 product set up in the system with a type = preordered charge