How to merge parts of two iPhoto libraries and remain separate users
We have two user accounts - let's call them A and B - on our iMac and hence two separate libraries which is fine for the major part of our photos, but we have many photos of mutual adventures and hopefully more to come in the future. If this is relevant: the photos are imports from other computers, but are no longer available from these computers. There's a continuous backup on Time Capsule via Time Machine.
We would like to share the photos from the two existing accounts, except those that are from each users past.
I expect to have to move or copy some photos including new imports in the future to a new shared library AND keep our old libraries from the past separate as they are from the past.
I further more would like to share the photos from mutual adventures to to Apple TV - maybe via Airplay as I can already do with the iTunes library on account A.
It seems to me the best way would be to have a separate user account - account C - for mutual iPhoto and our music in iTunes, BUT user A synchronize the music to my iPhone and user B does not yet. To complicate things - I think - user B has less storage on the iPhone than user A, so the full iTunes library simply does not fit on user B. I do realise it's possible to do selective synchronisation of music, but will this work in such a setup?
How do I do this?
iPhoto '08, Mac OS X (10.6.8), iPhone 4 32 GB and iPhone 4 8 GB