Trim Surface Macro - Need Help!!!

A macro to split a cylindrical surface with two planar surfaces, the end result is a quater of a cylinder. The trimmed surface is then mirrored about the plane.

The result needed is not always be the same quater of the surface (see EndSurface.SLDPART)

How to obtain the trimmmed surface? Trim type - Mutual

How to choose in the program/code which quadtrant  to retain?

I have recorded the macro and run it but doest not give the result (see Recorded code below)

By adding the names to the sufaces, the code selects the surfaces (see Modified Code below) but with out end result (a quater of a surface).

See the attached files for intial model and the final result.  (startSurface.SLDPART and EndSurface.SLDPART).

___________________________________________------Recorded code---------------------------------_______________________________

Dim swApp As Object

Dim Part As Object
Dim boolstatus As Boolean
Dim longstatus As Long, longwarnings As Long

Sub main()

Set swApp = Application.SldWorks

Set Part = swApp.ActiveDoc
boolstatus = Part.Extension.SelectByID2("", "SURFACEBODY", -8.07831735336606E-02, 0.12533729501655, 0, True, 0, Nothing, 0)
boolstatus = Part.Extension.SelectByID2("", "SURFACEBODY", 0, 0.112408979389443, -9.00572071890338E-02, True, 0, Nothing, 0)
boolstatus = Part.Extension.SelectByID2("", "SURFACEBODY", -5.68650625939711E-02, 4.60407418556201E-02, 3.78374670210064E-02, True, 0, Nothing, 0)
boolstatus = Part.FeatureManager.PreTrimSurface(True, False, False, False)
Dim myModelView As Object
Set myModelView = Part.ActiveView

' Roll View
Dim swModelView As Object
Set swModelView = Part.ActiveView
swModelView.RollBy 0
Dim myFeature As Object
Set myFeature = Part.FeatureManager.PostTrimSurface(True)
End Sub

________________________________________________________________________________________________________________

-----------------------------------------------------------------------------------------Modified Code------------------------------------------------------------------------------

Dim Part As Object
Dim boolstatus As Boolean
Dim longstatus As Long, longwarnings As Long

Sub main()

Set swApp = Application.SldWorks

Set Part = swApp.ActiveDoc

'--------------------------------------------------Added the names of surfaces------------------------------------------------------
boolstatus = Part.Extension.SelectByID2("Surface1", "SURFACEBODY", 0, 0, 0, True, 0, Nothing, 0)
boolstatus = Part.Extension.SelectByID2("Surf_Plane1", "SURFACEBODY", 0, 0, 0, True, 0, Nothing, 0)
boolstatus = Part.Extension.SelectByID2("Surf_Plane2", "SURFACEBODY", 0, 0, 0, True, 0, Nothing, 0)

boolstatus = Part.FeatureManager.PreTrimSurface(True, False, False, False)
Dim myModelView As Object
Set myModelView = Part.ActiveView

' Roll View
Dim swModelView As Object
Set swModelView = Part.ActiveView
swModelView.RollBy 0
Dim myFeature As Object
Set myFeature = Part.FeatureManager.PostTrimSurface(True)
End Sub

------------------------------------------------------------------------------------------------------------------------

Thank you in advance for the help.