Setting permissions and groups across two domains/Trust

I have two separate organizations, two separate domains, and two forests.  The two organizations have somewhat combined.  I have created a two way trust between companyA.local and companyB.local.  To make sharing of some resources easier I want to set up groups that traverse both domains.  I can set up a group on either side but can only add users from that domain.  What can I do to accomplish what I am trying to do? I am running at a 2008R2 functional level.

I am not sure if this is routed properly.
dustaineAsked:
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Haresh NikumbhConnect With a Mentor Sr. Tech leadCommented:
refer this guide which will help you to configure resources across forests

http://technet.microsoft.com/en-us/library/cc772808%28v=ws.10%29.aspx
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Matt VConnect With a Mentor Commented:
The short answer being that there is no global inter-forest groups or users, and the trusts are the only things that allow external access to resources.
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