Попробуйте переключать настройки http://help.solidworks.com/2012/english/api/sldworksapi/rebuild_document_on_activation_example_csharp.htm
А можно ещё попробовать изменять свойства детали
Option Explicit
Dim swApp As SldWorks.SldWorks
Dim Part As SldWorks.ModelDoc2
Dim assy As SldWorks.AssemblyDoc
Dim boolstatus As Boolean
Sub main()
Set swApp = Application.SldWorks
Set Part = swApp.ActiveDoc
Set assy = Part
boolstatus = Part.Extension.SelectByID2("Part1-1@Assem1", "COMPONENT", 0, 0, 0, False, 0, Nothing, 0)
'Part.CompConfigProperties4 2, 0, True, "Conf1", False
assy.Co