Combine licenses with different expiry dates

I searched the forums and was not able to locate any posts related to our query. We currently have two separate licenses for PDFCreator Terminal Server Edition which have different expiry dates. One license is for 3 devices which has just expired and the other is for 1 device which expires in November. Is there a way we can combine both of these licenses so that we only have one license for 4 devices all with the same expiry date, say by pro-rata charging so that all of the licenses match up. Thank you.