Hi
Below snippet is from the AutoCAD Online Help File [F1] -
Contents tab -> AutoCAD Online Manuals -> Customization Guide -> Linetypes and Hatch Patterns -> Linetype Definition Files -> Complex Linetypes -> Text in Complex Linetypes
<snip>
style
The name of the text style to be elaborated. The specified text style must be included. If it is omitted, use the currently defined style.
</snip>
+
Check out the following thread (especially take not of any links within) -
Custom Linetype
Have a good one, Mike