[AUCTeX] Subfiles package and reftex

[edgar]

Hi there,

I would like to know if there is a way to
(1) set a master file (Master.tex) which includes other files (\input, 
\subfiles, \include or any other) with relative paths
(2) those other files (header.tex, File1.tex, File2.tex...) have labels 
(as in \label{fig:NicePicture})
(3) set a cross-reference between those labels (File1.tex has 
\label{fig:NicePicture} somewhere, and File2.tex has 
\cref{fig:NicePicture})
(4) set a bunch of styles (\usepackage, \newcommand, etc.) in one of the 
external files (header.tex, for instance)
(5) use RefTeX to create those cross-references.

Say, something like this:
|-Master.tex
|-preamble.tex
|-File1.tex
|-File2.tex

But sometimes, I want to see how File2.tex looks like as a PDF before 
compiling the whole thing. So, I set \usepackage{subfiles} in 
preamble.tex and load it at the top of Master.tex with 
\input{preamble.tex}. This loads all my \newcommand, styles and package 
options when I run pdflatex. However, I am unable to use RefTeX between 
File1.tex and File2.tex. I have set the %%% TeX-master: "Methods" at the 
bottom of File1.tex and File2.tex. In case that someone is willing to 
help me out, I am adding the relevant sections of my .emacs. Thank you 
very much!

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.emacs
Description: Text document