This menu contains items which should be useful when preparing an image for printing.
You need to be careful about colour temperature issues: all printers work with D50, and nip is all D65. For example, to import a D65 LAB image from device-space use Print=>D50Lab_to_D50XYZ to get an XYZ image with a D50 whitepoint (it'll look orange, that's OK). Use Colour=>Colour_temperature=>D50XYZ_to_D65XYZ to approximate D65 from the D50 image. Use Colour=>XYZ_top=>Lab to make a D65 LAB image.
All printers also work with relative colorimetry, and nip is generally absolute. Use ICC_ac2rc to scale an absolute colorimetric image by a media white point.