How do I split up a large document into smaller files while keeping the same format?

Instead of posting in a six-year-old thread, it might have been better to explain exactly what it is that you are trying to do in a new thread. What you are starting with and what you aim to end up with.

Hi, i tried your advice and it's work. But the problem is the format/style is not copied.

Perhaps you should start at the beginning. What kind of document are you trying to split and what determines where those splits should occur? Cindy's suggestion requires a particular kind of formatting that many documents (e.g. those typically produced by mailmerges) lack.

Hi Cindy,

I have done all your steps except I get an error message that pops up saying, "The selection does not consist of heading levels". In your answer you said each new subdocument must be formatted with a Heading style. How do I do that?

Thank you so much!

Hi Terry

Outline view (as always). In the group just to the left of the "close" button, the first button on the left displays the "Master document" tools. I only have the German version of 2010 installed, currently, which is why this is all so cryptic :-) In 2007 this button is labelled "Show Document", in the Master Document group.