This example creates a new document, creates a nested table with three levels, and then fills the first cell of each table with its nesting level.
Documents.Add
ActiveDocument.Tables.Add Selection.Range, _
3, 3, wdWord9TableBehavior, wdAutoFitContent
With ActiveDocument.Tables(1).Range
.Copy
.Cells(1).Range.Text = .Cells(1).NestingLevel
.Cells(5).Range.PasteAsNestedTable
With .Cells(5).Tables(1).Range
.Cells(1).Range.Text = .Cells(1).NestingLevel
.Cells(5).Range.PasteAsNestedTable
With .Cells(5).Tables(1).Range
.Cells(1).Range.Text = _
.Cells(1).NestingLevel
End With
End With
End With