How can I create a new linetype in the LIN library so I can load it into my layers dialog box. For example: there is a gas line linetype already created in the library. But when I went into the library and used a copy of that syntax and edited it for water, it didn't work.
I guess the easiest thing to do would be to copy the definitions (using Notepad) from LIN file and paste it into a LIN file set to load as default (ACAD.LIN). One thing you need to make sure is that linetype scale is set correctly. See following for more info: http://docs.autodesk.com/ACD/2010/ENU/AutoCAD%202010%20User%20Documentation/index.html?url=WS73099cc...
Other solution may be to create new LIN file and then create LSP routine to load it upon each drawing opening. This would be something like this:
for instance treeline: *TREELINE_L, Tree Line left side
A,0,-.13,[TREE,AECCLAND,s=.13],-.12
*TREELINE_R, Tree Line right side
A,0,-.13,[TREE,AECCLAND,s=.13,r=180],-.12
3. Make a copy of .lin file in C:\Program Files\AutoCAD Civil 3D <verision>\Support.
4. Open acad<version>.lsp file with notepad from the same director
5. Add (command "_.-linetype" "_load" "*" "<linetypename>.lin" "") before ;;silent load
6. Save acad<version>.lsp
7. Restart Civil 3D
This should load your linetype. Note: you may need to play with parameters until you get teh scale that works for you. Use that link above to get familiar.
Hope this helps.