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Migrate a Repository Subfolder to Another Repository

If you have a subfolder that you'd like to migrate from one repository to another SVN has some built in tools that allow you to do that.

1. Open a command prompt and point it to the directory SVN is installed.  For Windows that is C:\Program Files\VisualSVN Server\bin.  The default Repository directory is C:\Repositories.
2. Type: svnadmin dump "path to Repository" > repoDumpFile.dmp
3. You'll then to filter out everything but the sub directory you want to migrate.
   Type: svndumpfilter include "Path to Subfolder" < repoDumpFile.dmp > Filtered-repoDumpFile.dmp
4. The above command will include all revisions even those not relevant to the subfolder you are migrating.  If you'd like to remove the non relevant revisions and/or re number them you can use the below command instead of the above.
   Type: svndumpfilter include "Path to Subfolder" --drop-empty-revs --renumber-revs < repoDumpFile.dmp > Filtered-repoDumpFile.dmp
5. Let's create the new Repository.
   Type: svnadmin create "Path to Repositories\New Repository Name"
6. Now we import the file.
   Type: svnadmin load --ignore-uuid "Path to Repositories\New Repository Name" < Filtered-repoDumpFile.dmp

References: http://svnbook.red-bean.com