If your program has a "Text on Path" capability, then you can do it. Just draw a line at the angle you want, select the Type on path tool, click on the path and start typing. The only difference will be the orientation of the type to be perpendicular with the path you have drawn.
If you need the type to remain vertical, then the only ay to achieve it will be a slant applied to the letters that offsets the angle of the path you're typing on.