This example indents each paragraph in the first list in document one by one level.
Documents(1).Lists(1).Range.ListFormat.ListIndent
This example formats paragraphs four through eight in the active document as an outline-numbered list, and then it indents the paragraphs one level.
Set myDoc = ActiveDocument
Set myRange = _
myDoc.Range(Start:= myDoc.Paragraphs(4).Range.Start, _
End:=myDoc.Paragraphs(8).Range.End)
With myrange.ListFormat
.ApplyOutlineNumberDefault
.ListIndent
End With