\newfont{\boldit}{cmbxti10}or
\newfont{\boldslant}{cmbxsl10}(There is a small difference between the look of italicized and slanted text; you may want to try samples of both to compare.)
These commands loads the specified font and defines the control sequence you specify as the command to switch to this font. You can now use the font by either prefacing the text you want to change with the \boldit or \boldslat command and enclosing the whole thing in {}'s; thus:
{\boldit This text will be in bold italics}, but this text will be in the normal font.or you can surround the text by:
\begin{boldit}The number after the decimal tells you the size of the font. If you want the same font scaled to be larger, you can try using the scaled command when you load the font, like:
Text here.
\end{boldit}
\newfont{\boldit}{cmbxti10 scaled \magstep 1}cmbxti10 only comes in the two sizes; the normal size and scaled \magstep1, which is the size of 12 point type.