To Create a Custom Text Style (AutoCAD Mechanical Toolset)

At the Command prompt, enter STYLE.
Click New. The New Text Style dialog box is displayed.
In the Style Name box, type the name of the style to create and click OK. You return to the Text Style dialog box.
In the Font Name box, select the font to use.
In the Height box, type 0 (zero).
Note: AutoCAD Mechanical toolset automatically manipulates text heights. To preserve this behavior, set text heights of custom text styles to 0.
Click Apply.
Click Close.