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A cost sharing arrangement is basically 2 entities sharing the cost of developing an intangible property
its fairly rare, but you can read about it here:
If you have any doubts as to whether or not the the parent company has any CSA
CSA's, I would ask.......they may have to get in touch with the parent company to find out if they have any, but as I said, at least in my experience (26 years) I've only had one.........and they sent along paperwork acknowledging that they had one.
Question 4 would of course only be relevant if you answered yes to #3
I hope this helps you