We currently import the CC field as a custom field. We shouldn't do that at all, it's useless like that. We should also convert it to a subscription if possible, but we don't know the full email address and if we did it may not match an Allura user. A halfway solution might be to consider each CC as a vote.
https://sourceforge.net/apps/trac/mcclidar/ticket/33 is one example. Don't have an example of multiple CCs handy
Diff:
For now lets just do the easy fix of not making this field a custom field at all. Ignore it.
allura:tv/6708
https://sourceforge.net/apps/trac/mcclidar/ticket/33
https://sf-tvansteenburgh-1020.sb.sf.net/p/test6549/mcclidar-3/33/