how do you sync into a specific namespace?

Namespace properties seem to sync along with the actual backups.
If you try to sync something in namspace /a to a PBS with namspace /b, what you get is /b/a/.

I want to grab stuff from /a on the first server and put it into /b without its namespace properties.
I want /a from the first server to go into /b. Just that. Just the content, not the freakin namespace too.

How do I do that?