Programmatic configuration all or nothing?

When using ConfigurationBuilder is it all or nothing or can you integrate what your builder builds into the existing log4j that’s already been initialized from log4j.xml. Actually I’ve already initialized using my xml “manually” using setConfigLocation earlier.

With 1.x you can get a reference an existing logger (already defined by log4j.xml) and then attach appenders to it.

That’s what I ideally want to do with ConfigurationBuilder so that I can still statically setup other loggers that don’t need to be dynamically created.