Autodesk AUTOCAD 2006 Command Reference Manual page 711

Linetype
Displays and sets the linetype for elements in the multiline style. When
you choose Linetype, the Select Linetype Properties dialog box is displayed,
which lists loaded linetypes. To load a new linetype, click Load. The Load
or Reload Linetypes Dialog Box is displayed.
Offset
Specifies the offset for each element in the multiline style.
a four-element multiline, each element offset
from 0.0
Offset Color Ltype
Displays all the elements in the current multiline style. Each element in
the style is defined by its offset from the middle of the multiline, its color,
and its linetype. Elements are always displayed in descending order of their
offsets.
Outer Arc
Displays an arc between the outermost elements of the multiline.
without Outer Arc
0.1
0.0
-0.1
-0.3
-0.45
with Outer Arc
New, Modify Multiline Style Dialog Boxes | 687