Document Classes ⇒ Moving '\renewcommand' into a Class

[isharp2]

I used to have the following guidelines set up in my .tex file for customizing section, subsection and subsubsection, which redefined as 'mysection, mysubsection and mysubsubsection', respectively.

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%This next line makes sure to center all section titles, figures are in arabic and centered
\titleformat{\mysection}[2][]
  {\section[#1]
    {\centering #2}
%      \setcounter{figure}{0}
      \renewcommand{\thefigure}{\arabic{figure}} %Arabic figures
      \renewcommand{\thesection}{\Roman{section}}               %Roman numeral title
}

%Subsections do not get centered
\titleformat{\subsection}[2][]
{\subsection[#1]{#2}
%  \setcounter{figure}{0}
  \renewcommand{\thefigure}{\arabic{figure}}
  \renewcommand{\thesubsection}{\Alph{subsection}.} %Make sure the subsection label counter is capital A through Z followed
}

%subsub section should not include the 'ALPHA' subsection before it
\titleformat{\subsubsection}[2][]
{\subsubsection[#1]{#2}
%  \setcounter{figure}{0} %We would only reset the counter if we wanted each subsection to have a different figure number
  \renewcommand{\thefigure}{\arabic{figure}} %Set figures to Arabic numbers 1 - 9
  \renewcommand{\thesubsubsection}{\arabic{subsubsection}} %Make sure the subsection label counter is 1 through 9 with no '.', 'arabic' 
}

However, I would like to be able to move this into a class file, so that my .tex looks more clean. When I do, I get compilation errors, such as:

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Runaway argument?
! Paragraph ended before \ttl@format@ii was complete.
<to be read again> 
                   \par

Lastly, if there is a way to overwrite the standard article 'section', instead of redefining 'mysection', etc without losing these functions, I would be grateful to hear how.

thanks,