Darchind, your last post added information missing from the original post. In your original post, you talked about creating materials in Poser, so I assumed that is what you had done, and that it was a material zone created in Poser that you needed to get rid of. Now it's clear that the materials you don't want came from the M3 cr2. These are not material zones, just material definitions (material settings), and they only exist in the cr2, and thus you only need to edit the cr2 to get rid of them.

Get CR2Editor (or one of the other editors mentioned in my last post). In CR2Editor (for example),  load the cr2, and scroll down until you see the 'figure' section (near the bottom of the file), and expand that section by clicking the + sign next to it. Scroll down again until you see the lines starting with the word 'material'. Click on a 'material' that you want to delete, then press the keyboard Delete key. Do the same for other materials you want to delete. Save the cr2 back to disk. The process is similar in other editors, in some editors you can select and delete multiple materials in one go, but CR2Editor only allows you to select one at a time.

If you were to delete all the materials from the cr2, the next time you loaded the figure, Poser would read the material zones from the obj file and add corresponding material definitions to the figure. You would need to save the figure again for these to become a permanent part of the cr2.

Assuming that your obj file is your own creation, and not just a morph of the m3 obj, you will probably also want to delete any morphs from the figure. Morphs are stored in the individual actors as 'targetGeom' sections and can be deleted in the same way as the materials. Also any 'valueParm' (FBM) channels in the BODY actor can be deleted in the same way.  

CR2Editor can only open cr2 files, it can't open crz files. If your figure is saved as a crz, open it in Poser, then in Edit menu > General Preferences > Misc tab, deselect 'Use file compression', then resave the figure to create a cr2.

@TrekkieGrrrl,

No, adding materials via a pz2, mc6, or mt5, will not affect the obj file.