Ahhhh, Kirk is not looking on the L drive!
Nor is he asking his in-house buddies for help! Nor is he using the Portal! Ewwwwww!
Ok, go to the L drive where our custom content is and keep going to the following location.....\Architectural Library\Families\Detail Components\00 Misc. Here you'll find the family DC_Linetype_LB_shw.rfa. You can create different types with any letter/letters you want, vary the spacing, etc. There are some family types that serve as an example, so I'm sure you'll figure out how to use the family and add your own designations.
As for the rest reading this post, I'm in a sharing mood, so I'm attaching the family