AutoCAD VB :: How To Add And Remove Drawings From A Sheet Set

I am trying to write a program that will add and remove drawings from a sheet set as needed.  I did figure out how create and open sheet sets with VBA (below).

how to add and remove drawings to a sheet set. 

Public Sub CreateSheetSet(SS As String, SSName As String, SSDesc As String)
  '' Create a Reference to the Sheet Set Manager Object
  Dim oSheetSetMgr As AcSmSheetSetMgr
  Set oSheetSetMgr = New AcSmSheetSetMgr
  '' Open a Sheet Set file
  [code]....