I transfered all of my content from my iMac to a new AirMac
If so, then there shouldn't be anything else to transfer. More details are needed. Alternatively, restore the MacAir to its shipped state and redo the migration, following the steps in Pondini's Setup New Mac guide.
Let me give 2 examples:
I transferred Aperture to the Air Mac
and since the transfer, I have download and PP several photos, I have updated a Bento file from 5600 names to 6200 names.
Currently the only way I can think of is to repost all the Bento files and put the PP photos in an e-mail and send it to my address and manually enter it into Aperture.
I hope I am making sense of this.
Ah! Thnaks for clarifying. You're trying to keep the two machines synched. That's a difficult proposition without having both on a local network and enabling sharing. I don't know of any software that does that, so you'll have to check around for that. IIRC, iCloud can deal with some Apple app stuff, but I don't do cloudy stuff.