Sorry if this has been asked a thousand times before but how do I export an .obj (or fbx) from Houdini that has had multiple materials applied and keep the material zones intact?

I'm trying to export a very simple object to DAZ Studio as a learning excercise but it only comes in with a single material applied to the entire object not as per the groups I'd set up in Houdini.

I'm loving Houdini so far, just hit a brick wall with this.

Thanks in advance.