follow code, select  component  in Assembly.

result

*************************************************************

File = D:\bb\aa.SLDASM

  Component    = bb-1/cc-1/dd-1 [D:\bb\dd.SLDASM]

    ParentComp = bb-1/cc-1 [D:\cc.SLDASM]

***********************************************************

'---------------------------------------

'

' Preconditions:

'             (1) Assembly document is open.

'             (2) Assembly component is selected.

'

' Postconditons: None

'

'---------------------------------------

Option Explicit

Sub main()

    Dim SwApp                       As SldWorks.SldWorks

    Dim SwModel                     As SldWorks.ModelDoc2

    Dim swSelMgr                    As SldWorks.SelectionMgr

    Dim swConfigMgr                 As SldWorks.ConfigurationManager

    Dim swConf                      As SldWorks.Configuration

    'Dim swConf                      As SldWorks.Configuration

    Dim swComp As Component2

    Dim SwParentComp                As SldWorks.Component2

    Dim bRet                        As Boolean

    Set SwApp = Application.SldWorks

    Set SwModel = SwApp.ActiveDoc

    Set swSelMgr = SwModel.SelectionManager

    Set swComp = swSelMgr.GetSelectedObjectsComponent2(1)

    ' Returns NULL if selected component is a top-level component

    Set SwParentComp = swComp.GetParent

    'Debug.Print swParentComp.Name2

    'Debug.Print SwComp.Name2

    If Nothing Is SwParentComp Then

        Set swConfigMgr = SwModel.ConfigurationManager

        Set swConf = swConfigMgr.ActiveConfiguration

        Set SwParentComp = swConf.GetRootComponent

    End If

    Debug.Assert Not SwParentComp Is Nothing

    Debug.Print "File = " & SwModel.GetPathName

    Debug.Print "  Component    = " & swComp.Name2 & " [" & swComp.GetPathName & "]"

    Debug.Print "    ParentComp = " & SwParentComp.Name2 & " [" & SwParentComp.GetPathName & "]"

End Sub