Aligning table within latex editor

In TexStudio you select the data in your table and go to (top of the screen)

LaTeX > Manipulate Tables > Align Columns

This will neatly align your table at the &'s.

use latexindent! You can find it here: https://github.com/cmhughes/latexindent.pl

If I have a main.tex like:

\documentclass{article}
\usepackage{siunitx}

\begin{document}    
\begin{tabular}{%
l
S[table-format=3.0]
S[table-format=3.2]
S[table-format=2.2]
S[table-format=3.2]
S[table-format=-2.2]
S[table-format=3.2]
}
Latex & 360 & 101.77 & 10.71 & 101.86 & 64.60 & 127.20  \\ 
Manufacturing & 360 & -7.33 & 12.59 & -7.24 & -49.00 & 22.00  \\ 
Cons & 360 & -17.19 & 23.4 & -17.22 & -79.00 & 43.00 \\ 
Apple and Orange & 360 & 3.38 & 13.84 & 3.60 & -47.00 & 29.00   \\ 
Services and Harry  & 104 & -4.96 & 20.8 & -4.81 & -57.00 & 30.00   \\ 
Manchester & 360 & -9.29 & 8.64 & -9.26 & -35.00 & 8.00 \\ 
\end{tabular}   
\end{document}

and run

latexindent -w main.tex

I get

\documentclass{article}
\usepackage{siunitx}

\begin{document}    
\begin{tabular}{%
        l
        S[table-format=3.0]
        S[table-format=3.2]
        S[table-format=2.2]
        S[table-format=3.2]
        S[table-format=-2.2]
        S[table-format=3.2]
        }
        Latex              & 360 & 101.77 & 10.71 & 101.86 & 64.60  & 127.20 \\ 
        Manufacturing      & 360 & -7.33  & 12.59 & -7.24  & -49.00 & 22.00  \\ 
        Cons               & 360 & -17.19 & 23.4  & -17.22 & -79.00 & 43.00  \\ 
        Apple and Orange   & 360 & 3.38   & 13.84 & 3.60   & -47.00 & 29.00  \\ 
        Services and Harry & 104 & -4.96  & 20.8  & -4.81  & -57.00 & 30.00  \\ 
        Manchester         & 360 & -9.29  & 8.64  & -9.26  & -35.00 & 8.00   \\ 
    \end{tabular}   
\end{document}

in a second.

Please read the manual before, as this is overwriting your input file. The tool gets even nicer in combination with arara. For example:

% arara: indent: {overwrite: yes; trace=true}