If you create an InDesign book file from the chapters you have, you can use it to synchonize your styles, and you can also use it to create a single PDF file.
Just wondering, once I open File>New>Book the book panel appears and I add all my chapters, where's the option to export to PDF? All I see is the panel and five options (sychronise, save, print, add, delete).
Sorry just getting my head around the book function.
What version of InDesign are you using? When I open a Book panel, there are many more options. Make sure that in your Book panel, none of the chapters are selected (click in the white space at the bottom to deselect). You should see some export options available for PDF and EPUB.
CS2. I found it there. It's in the pop out menu - the little arrow. Thanks for your help!