hidden lies

Hi members!
could any one please tell me how to get hidden lines(dotted lines for hidden elements/section parts) in draft? do I need to define a local rule for that? Please keep in mind that I am a beginner in PDMS draft. If you can share with me any materials for dummies that would be great.
thanks in advance.

make some local rules if requirement is limited to one or two drawings other wise go for rules creation in your draft administration library

thank you deva.