Combine multiple preorder purchases

I noticed when readers preordered for RARE, if they made more than one purchase (for example, I added a special edition on at a later date so many who had already preordered, placed a second order for that), it came up as separate orders meaning I had to comb through the spreadsheet searching for orders under the same name so I could package them together. A facility to automatically recognise the name and email and then group those orders together as one would be amazing for authors.