To change general code formatting preferences, use the Code Format category of the Preferences dialog box. To change the format of specific tags and attributes, use the Tag Library Editor (Edit > Tag Libraries). For more information, see Using Dreamweaver on the Dreamweaver Help menu.
You can also edit the formatting for a tag by editing the VTM file that corresponds to the tag (in a subfolder of the Tag Libraries configuration folder), but it’s much easier to change formatting within Dreamweaver.
If you add or remove a VTM file, you must edit the TagLibraries.vtm file; Dreamweaver ignores any VTM file that is not listed in TagLibraries.vtm.
Edit this file in a text editor, not in Dreamweaver.