Welcome to the forum
The fact that you have css styles indicates you are using RH
HTML. When you generate the printed output, in the last page of the
wizard you can select to use the project's css styles and RH will
then create the necessary styles in Word. There's a full topic on
generating printed documentation on my site.
I don't follow the logic of only updating that Word document.
Why would you not want to keep the online help up to date as well?
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