I could never be able to use Extra and Ulta Bold font series. Do you know how to define these. Below is my code:
\documentclass{article}
\usepackage{anyfontsize}
%\usefont{enc}{family}{series}{shape}
\newcommand{\bfont}{\usefont{T1}{cmr}{b}{n}\fontsize{10}{\baselineskip} \selectfont}
\newcommand{\ubfont}{\usefont{T1}{cmr}{ub}{n}\fontsize{10}{\baselineskip} \selectfont}
\newcommand{\ebfont}{\usefont{T1}{cmr}{eb}{n}\fontsize{10}{\baselineskip} \selectfont}
\begin{document}
Normal\\
{\bfont Bold}\\
{\ubfont Ultra Bold}\\
{\ebfont Extra Bold}\\
\end{document}
