I am using the titlesec package but the numbering of section and subsections disappeared. I need to retrieve it. my code is
\titleformat{\section}[block]{\color{blue}\Large\bfseries\filcenter}{}{1em}{}
\titleformat{\subsection}[hang]{\bfseries}{}{1em}{}
I need to achive the following specs: Main headings: Arial, Size 12, Bold, Uppercase, Center Justified.
Sub-headings: Arial, Size 12, Bold, Title case, Left Justified.

\thesectionin the second mandatory argument. Similarly, add\thesubsectionin the the corresponding command. Your specifications don't say anything about changing colors, and yet you have a change to blue? – Gonzalo Medina Apr 21 '13 at 04:41