trust forest users can not map, Exp ads users and imp ads users to new ads, conversion of DC into child domain

I have created trust replationship between two different forest , both forest domain users can access resource of each domain but can not  map user's account of each domain , for an example if i want to give rights on folder other domain user's account i can't do that, there is any possible way ?

How to export ads users and then import users in to new ADS? there is any script which can easy administrative effort for us ?

there is any way for domain controller, that we can convert domain controller into child domain without demotion ?
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Brian PierceConnect With a Mentor PhotographerCommented:
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