Copying (branch/tag), dumping, and filtering repository contents

As most of you know from my prior questions (still hoping for some more
replies), I am dealing with repository load issues. I lack
understanding about how the revision histories work, and the effect upon
dump filters.

What are the best practices in project structure management with respect
to dumps and filters? I read and understand everything about the trunk,
branches, and tags layout, but I am in the dark about dumping, filtering
and loading.

Given the standard layout, if I were to dump the repository and filter
for a specific TAG, what would happen? Would I get a message about
revisions not being found because they're in TRUNK? If not, would I get
all the revisions right back to the initial ADD, which occurred in
trunk? If not, is this considered a problem?

For example, as a DotNet shop, we have several projects that are
referenced together in "solutions". Several of those projects are
effectively "shared" in that they are common libraries, but are
maintained as source code references (rather than DLL references) to
permit ongoing development. The application itself, "/Projects/AAA" has
3 or 4 projects that aren't shared.

Eventually, we decide to start a new branch of the core project, so we
create the branch of AAA (/Projects/AAA/Branches/R2"). We might not
decide to branch the Common ("/Projects/Common") projects.

So:
/Projects/Common
        Trunk
        ------|---- Common1
                |---- Common2 ...
        Branches
        Tags

/Projects/AAA
        Trunk
        Branches
                R2
                |----View
                |----Business
                |----DAL
        Tags

The solution contains:
MySln.sln
        Common1
        Common2
        View
        Business
        DAL

Months go by, and we decide that we want to move R2 and associated
Common projects into a new repository. How would I do that? For that
matter, would we be able to maintain a Visual Studio solution that
referenced two different SVN sources as shown above?

--
David Bicking
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