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Final solution is:

Public Class RWEI_0001A
	Shared oTextSave As String = "C:\Users\Public\Documents\iLogicBuffer.txt"
	
Sub Main() 
	'Accessing Assembly Components @ https://modthemachine.typepad.com/my_weblog/2009/03/accessing-assembly-components.html
	Dim oDashes As String = ""
	Dim iL_NO As String = "0009-BOM"
	Dim iL_Name As String = "All Occurrences with BOM Structure"
	Dim iL_FullName As String = "Rule " & iL_NO & ": " & iL_Name
	Dim oDoc As Document = ThisApplication.ActiveDocument
			
	oDelete_ex_Notepad(oTextSave, iL_NO)
	oHL1 = "FILE REFERENCE TREE RAN FROM: " & oDoc.FullFileName
	oWrite_HeaderLines(oTextSave, oHL1)
	oHL2 = iL_FullName
	oWrite_HeaderLines(oTextSave, oHL2)
	For i = 1 To Len(iL_FullName)
		oDashes = oDashes & "-"
	Next i
	oWrite_DashLine(oTextSave, oDashes)
	
    ' Get the active assembly. 
    Dim oAsmDoc As AssemblyDocument 
    oAsmDoc = ThisApplication.ActiveDocument 

    ' Call the function that does the recursion. 
    Call TraverseAssembly(oAsmDoc.ComponentDefinition.Occurrences, 1) 
	Process.Start("Notepad.exe", oTextSave)
End Sub 

Private Sub TraverseAssembly(Occurrences As ComponentOccurrences, Level As Integer) 
    ' Iterate through all of the occurrence in this collection.  This 
    ' represents the occurrences at the top level of an assembly. 
    Dim oOcc As ComponentOccurrence 
    For Each oOcc In Occurrences 
        ' Print the name of the current occurrence. 
        ' Check to see if this occurrence represents a subassembly 
        ' and recursively call this function to traverse through it. 
        If oOcc.DefinitionDocumentType = kAssemblyDocumentObject Then 
            Call TraverseAssembly(oOcc.SubOccurrences, Level + 1) 
        End If 
	
		oFFN_cw_EXT = oOcc.ReferencedDocumentDescriptor.ReferencedDocument.FullFileName	'cw file extension	
		oStr = oDoc_LocalName_WExt(iL_NO, oFFN_cw_EXT)
		BOM_Structure_Return = Func_BOM_Structure(iL_NO, oOcc)
			'specify word splitting characters "space" and "dash"
			Dim Separators() As Char = {"*"c} 
			Sentence = BOM_Structure_Return
			Words = Sentence.Split(Separators)
			i = 0
			For Each wrd In Words
			'MessageBox.Show("Word Index #" & i & " = " & Words(i))
			i += 1
			Next
		BOM_Structure = Words(0)
		oOccurrence_FFN = Words(1)
		
'		oParent = oOcc.ReferencedDocumentDescriptor.ReferencedDocument.FullFileName
		Try
			Dim oParentocc As ComponentOccurrence
			oParentocc = oOcc.ParentOccurrence
			docFile = oParentocc.Definition.Document
		    oParent = System.IO.Path.GetFileNameWithoutExtension(docFile.FullFileName)
		    oParent = System.IO.Path.GetFileName(docFile.FullFileName)
		Catch
			oParent = System.IO.Path.GetFileNameWithoutExtension(oOcc.Parent.Document.DisplayName)
			oParent = System.IO.Path.GetFileName(oOcc.Parent.Document.DisplayName)
		End Try
	
'		If Level > 1 Then 
'			oParent = System.IO.Path.GetFileNameWithoutExtension(oOcc.ParentOccurrence.Definition.Document.FullFileName)	
'		Else 
'			oParent = System.IO.Path.GetFileNameWithoutExtension(oOcc.Parent.Document.DisplayName)
'		End If 
	
		oData_X = oParent & "@" & oStr & "@" & "Level-" & Level & "@" & BOM_Structure	
'		oData_X = oParent & "@" & oOcc.Name & "@" & "Level-" & Level & "@" & BOM_Structure
'		oData_X = oStr & "@" & oFFN_cw_EXT & "@" & BOM_Structure & " " & oParent & "@" & oOcc.Name & "@" & "Level-" & Level
		oWrite_Data(oTextSave, oData_X)
	Next 
End Sub

	Function oDoc_LocalName_WExt(iL_NO As String, oFFN_cw_EXT As String)
	oName_Sub = "oDoc_LocalName_WExt"
	oTitle = iL_NO & " @ SUB: " & oName_Sub
	oPos = Len(oFFN_cw_EXT) - InStrRev(oFFN_cw_EXT, "\", -1)
	oName_Local_cw_Ext = Right(oFFN_cw_EXT, oPos)
	Return oName_Local_cw_Ext 'Local file name complete with extension
	End Function

	Function Func_BOM_Structure(iL_NO As String, oCompOcc As ComponentOccurrence)
	oName_Sub = "BOM_Structure"
	oTitle = iL_NO & " @ SUB: " & oName_Sub
	Dim oOccurrence As ComponentOccurrence
	oFFN_X = oCompOcc.ReferencedDocumentDescriptor.ReferencedDocument.FullFileName
	BOM_X = oCompOcc.Definition.BOMStructure
	If BOM_X = BOMStructureEnum.kDefaultBOMStructure Then BOM_Structure = "Default"
	If BOM_X = BOMStructureEnum.kNormalBOMStructure Then BOM_Structure = "Normal"
	If BOM_X = BOMStructureEnum.kReferenceBOMStructure Then BOM_Structure = "Reference" 
	If BOM_X = BOMStructureEnum.kPhantomBOMStructure Then BOM_Structure = "Phantom"
	If BOM_X = BOMStructureEnum.kPurchasedBOMStructure  Then BOM_Structure = "Purchased"
	If BOM_X = BOMStructureEnum.kInseparableBOMStructure  Then BOM_Structure = "Inseparable"
	If BOM_X = BOMStructureEnum.kVariesBOMStructure Then BOM_Structure = "Varies" 

	oDoc_LocalName_WExt(iL_NO, oFFN_X)
	'BOM_Structure = oDoc_LocalName_WExt(iL_NO, oFFN_X) & " <- " & BOM_Structure & "(BOM STATUS: Default)"
	Dim BOM_Structure_Return As String = BOM_Structure & "*" & oFFN_X
	Return BOM_Structure_Return
	End Function
	
Function GetOccurrenceParent(oOcc As ComponentOccurrence, oOccName As String)

	Return oOcc.Parent.Document.DisplayName
End Function

'Process.Start("Notepad.exe", oTextSave)	
Sub oWrite_Data(oTextSave As String, oData As String)
	oWrite = System.IO.File.AppendText(oTextSave)
	oWrite.WriteLine(oData)	
	oWrite.Flush()
	oWrite.Close
End Sub

Sub oWrite_HeaderLines(oTextSave As String, oHeaderLine As String)
	oWrite = System.IO.File.AppendText(oTextSave)
	oWrite.WriteLine(oHeaderLine)	
	oWrite.Flush()
	oWrite.Close
End Sub
	
Sub oWrite_DashLine(oTextSave As String, oDashes As String)
	oWrite = System.IO.File.AppendText(oTextSave)
	oWrite.WriteLine(oDashes)	
	oWrite.Flush()
	oWrite.Close
End Sub

Sub oDelete_ex_Notepad(oTextSave As String, iL_NO As String)		'To delete oTextSave if existing.
'	Dim FileDelete As String
'	FileDelete = "C:\testDelete.txt"
 	If System.IO.File.Exists(oTextSave) = True Then
   	System.IO.File.Delete(oTextSave)
'	MessageBox.Show("Existing (if any) File Deleted", iL_NO)
	End If
End Sub
End Class