Some useful Preambles
Use \input in preamble:
@Code \documentclass{standalone}
@Code ...
@Code \input{../../TikZ.tex}
@Code ...
@Code \begin{document}
@Code ...
@Code \end{document}
Samples:
@Code Base.tex
@Code TikZ.tex
@Code Geometry.tex
@Code Language.tex
@Code MathOperators.tex
@Code NewCommands.tex
@Code Theorems.tex
@Code Listings.tex