How Do I Break Multiple Orders from the Same Buyer into 2 Shipments? (See Picture)

[postcardgameshop]

I had a customer buy multiple postcards from me today. All with eBay standard envelope as his shipping method. The total amount of postcards are 5 and weighs 1.2 ounces, and sold for $30. The weight is within the limits the policy sets, but the postcard count exceeds 3 and the price exceed $20 dollars. According the eBay Standard Envelope's policy, my envelop cannot exceed 3oz, $20 in value, or 3 postcards in the same mailer. However, as you can see from this picture the eBay options seem to be showing me that I can ship them with this service. Is there a way I can break the order up into two shipments so that I can be within the limits of the eBay Standard Envelope policy? I'd rather pay 1.20 and have the item fully covered with the policy's insurance, but I don't want to have to pay 3.90+ to ship them with first class.

[wastingtime101]

You should be able to buy 1 label with package dimensions and weight for the first 3 postcards, then go back to the order and purchase another label entering package dimensions and weight for the remaining 2 postcards.