It's the LtScale command that lets me set the scale of the linetype. Typically, the scale I use for text and dimensions and hatch patterns also applies to the linetype. The Change , ChProp , DdChProp , and DdModify commands let me change the linetype and scale. In LT R3, the Painter command copies the linetype and scale from one object and applies it to other, selected objects. Rename and DdRename change the name of linetypes.
Purge removes unused linetype definitions.
A linetype scale that looks fine in model space is going to look wrong in paper space. Then, by setting PLineGen to 48, AutoCAD automatically displays linetypes 48 times larger in paper space than in model space. There are a couple of other system variables that relate to linetypes. CeLtype holds the name of the linetype currently in effect. Then, there's the trick when it comes to polylines.