Sub TestTables()
  Dim aTbl As Table, aTblN As Table
  For Each aTbl In ActiveDocument.Tables
    Debug.Print aTbl.NestingLevel
    For Each aTblN In aTbl.Tables
      Debug.Print aTbl.NestingLevel, aTblN.NestingLevel
    Next aTblN
  Next aTbl
End Sub

Sub QuerryAllTables()
Dim oTbl As Table
Dim oRng As Range
  For Each oTbl In fcnCollectDocTables
    MsgBox "Cell count: " & oTbl.Range.Cells.Count & " - Nesting level:  & oTbl.NestingLevel"
  Next
lbl_Exit:
  Exit Sub
End Sub

Function fcnCollectDocTables(Optional ByVal oDoc As Document) As Collection
'Returns all tables (top level and nested) in one collection.
Dim colStack As New Collection
Dim oTbl As Table
  Set fcnCollectDocTables = New Collection
  If Documents.Count > 0 And oDoc Is Nothing Then
    Set oDoc = ActiveDocument
  Else
    GoTo lbl_Exit
  End If
  colStack.Add oDoc.Tables
  Do While colStack.Count > 0
    For Each oTbl In colStack(1)
      fcnCollectDocTables.Add oTbl
      If oTbl.Tables.Count > 0 Then colStack.Add oTbl.Tables
    Next
    colStack.Remove 1
  Loop
lbl_Exit:
  Exit Function
End Function