[Tex/LaTex] How to include a document into another document


I have two documents A and B. Both of them are separate documents. But document A also has to include document B.

Now if I use \include{B} i get the following error:

! LaTeX Error: Can be used only in preamble.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.

l.1 \documentclass

So how can I force to include document B with the "style" and "template" of document A?

Best Answer

Cut the content (the part between \begin{document}...\end{document} of B.tex into a new file B-content.tex.

Change B.tex to be:

% your preamble here

Then put \include{B-content} into A.tex.