I'm writing user manual for our project. There are 4 versions of this manual (probably will be more in future) depending of user group, for which it is intended.
Right now I hust have 4 documents and every time i'm updating this manual (and that is few times every month) i have to copy everything between documents and rememvber not to copy too much of too few to each document.

Is there a way to make it as one document, mark some sections like "section for group A, B" and another like "section for group A,B,C" etc. and then just mark what to show and generate PDF file? It would have to update TOC and page numbers according to what is visible.
It would save me a lot of work and reduce mistakes every time i have to update this manual.