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This is not a job for an office suite, but rather a post-processing tool, such as ghostscript (gs) or pdftk that can manipulate PDF files. It is possible to export greyscale pages to one PDF and all colour pages to another PDF. The colour PDF can then, if required, be converted from RGB to CMYK, although any decent print shop can do this anyway. Example ghostscript command:

$ gs -o cmyk.pdf -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress -sPRocessColorModel=DeviceCMYK -sColorConversionStrategy=CMYK -sColorConversionStrategyForImages=CMYK rgb.pdf

This is not a job for an office suite, but rather a post-processing tool, such as ghostscript (gs) or pdftk that can manipulate PDF files. It is possible to export greyscale pages to one PDF and all colour pages to another PDF. The colour PDF can then, if required, be converted from RGB to CMYK, although any decent print shop can do this anyway. Example ghostscript command:

$ gs -o cmyk.pdf -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress -sPRocessColorModel=DeviceCMYK -sProcessColorModel=DeviceCMYK -sColorConversionStrategy=CMYK -sColorConversionStrategyForImages=CMYK rgb.pdf