In the Create New Multiline Style dialog box, enter a name for the multiline style and select a multiline style from which to start. Click Continue.
In the New Multiline Style dialog box, select the parameters for the multiline style and click OK.
Descriptions are optional and can be up to 255 characters, including spaces.
In the Multiline Style dialog box, click Save to save the multiline style to a file (the default is acad.mln). You can save multiline styles to the same file.
If you create more than one multiline style, save the current style before creating a new one or you lose the changes to the first style.