[Stiglr]

The short answer is, "No"

If you break a model up into component parts, any of them can be assigned no texture at all, and then they will carry the "material color" in AC3D.

If you have a "part of a textured part" that shouldn't have or doesn't need a texture, for some reason, you should attempt to isolate those surfaces in the TCE, make them super small and move them to an area on the graphic that has a neutral or white color. Thus, it will seem like it has no texture to speak of.