NTFS & Share Permissions across forests

Due to business requirements, an existing single domain forest will be divided in to three forests (each with single domain) with no forest having any trust relationship with other forests. Each new forest contains a part of existing user set, with the requirement that no user will be part of more than one forest.

Now the requirement is - copy  the files along with share and NTFS permissions from existing forest to new forests, and if, say, two users belonging to different forests have access to same data, then copy the data to both the forests and modify NTFS and share permissions in each forest by removing that user who does not belong to that forest.

How do I accomplish this? Thanks in advance.

Note: We will be using ADMT to migrate users.
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Lionel MMSmall Business IT ConsultantCommented:
You can use robocopy to copy the data with the /COPYALL /SEC switches which will copy all the file and security info from one server to the next. Then you can use icacls to remove all existing permissions and replace it with what you want. You can also use net share to create the new shares. All of these can be automated if you have files with usernames, shares required, and permissions needed

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Windows Server 2008

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