How to merge AD domainB into domainA ?

We have a newly-acquired company with an AD domain, say domainB. We have a site-to-site VPN between domainB and the HQ domain - domainA, and also established bi-directional trust relationship between the two forests. Both are in Win 2003 AD level.
We want to merge/integrate/consolidate domainB's AD user accounts into domainA and hope if possible the security/sharing permission etc will also be transferred. How to do that?
CastlewoodAsked:
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FOXConnect With a Mentor Active Directory/Exchange EngineerCommented:
You will want to use ActiveDirectoryMigrationTool.  
https://technet.microsoft.com/en-us/library/cc974384(v=ws.10).aspx
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bbaoConnect With a Mentor IT ConsultantCommented:
it needs to be well planned both on paper and in a provision environment. heaps of things are to be considered.

a good start is from here:

http://m.windowsitpro.com/windows-server/plan-and-execute-active-directory-merger-part-1
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ZenVenkyConnect With a Mentor ArchitectCommented:
You have 1 free tool from Microsoft called ADMT (AD Migration Tool) and the other one requires some budget to buy this tool, it is called Dell Migration Manager for AD. As trust already established you don't have to do much of home work to start migration. However I would suggest create test environment and test one of the tool as per your requirement.

DMM User Guide
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