Merging a part of SVN repository to another repository with history

I have to svn repositories , lets say A and B. I want to add some of the directories of the B into A along with history.Is it possi开发者_如何学编程ble to do that. To make more clear, following is the scenario.

    repo A                                repo B
       \branches                          \branches 
             \sub-branch1                      \sub-branch B1
              \sub-branch2                      \sub-branch B2 
       \trunk                             \trunk 

What i would like to do is, add sub-branch2 in the branches of repo A. How could do it?

thanks in advance

Get the dump of sub-branch2 of repoB:

  svnadmin dump /location/of/repoB | svndumpfilter include subbranch2 > my.dump

Merge the dump into branches of repoA:

  svnadmin load /location/of/repoA --parent-dir branches < my.dump

Yes, this is possible. You need to use svnadmin dump and svnadmin load.
For more info, look here: http://blogs.nuxeo.com/dev/2006/04/dump-load-svn-repositories-using-svnadmin-svndumpfilter.html