What version of InDesign are you using? Are you printing directly from InDesign, or using PDF output?
If printing directly from InDesign, from the Print dialog you can choose Output > Color > Composite Gray.
If you have InDesign CS6 or CC, you can export a PDF for print in grayscale. The only PDF presets which work are those which support Output > Color > Convert to Destination (e.g., Press Quality or High Quality Print). Then choose a grayscale profile from the Destination menu (e.g., Dot Gain 15%).
I am using CS6 and will need to use PDF output for the commercial printer. I guess my main question is can I output in some way so that two pages will remain in color which the others change to Grayscale?
No, but you can out put two files, then replace the pages in the grayscale with ones from the color version in Acrobat.
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First export ust the two page to color PDF.
Second export the other page to Grayscale PDF.
On Acrobat you can merge two files from "Insert Pages".
Salah is correct. You can combine them in Acrobat. You could also use the File > Create > Combine Files into a Single PDF feature instead of Insert Pages.
I have just stumbled across this topic with a question similar to the original poster. In my own experiments I ran into an issue with InDesign when trying to place a Greyscale PDF within a new document, when I then export this the grey shows as white in Acrobat and displays an error. Not sure if you have ever encountered this?
My workaround was to output two files and merge them at the end however it seems there is a bug present.