I only know Bryce4 so if you are using an older ver I'm not sure if this will help but.... Once in your Material Editor and the Texture is loaded you can use the "copy method" as mentioned by Marty or if you (and it sounds like you do) want to use a 'special' BUMP then you can also click the little "LOAD" at the middle (BUMP) window and load the BMP. Also once the texture and BMP are loaded you can click the little "half-moon" circle above the middle window and INVERT the BUMP's effect (ie. swap the high/low effects)