Yes. A typical case is when QR codes are published in different media and you want to track the scans from each separately, as well the scans of all in aggregate.
The following example illustrates how to do this:
Individual reports for each QR code would represent reports for scans from magazines, direct mail and posters.
If all three QR codes are placed in a Group, the report on the Group level would show aggregate results for all three codes.
Please also see "What is a Campaign Group?"