Code:
Sub catmain()Dim partDocument1 As PartDocument
Set partDocument1 = CATIA.ActiveDocument
Dim part1 As Part
Set part1 = partDocument1.Part
Set hybridShapeFactory1 = part1.HybridShapeFactory
Dim hybridBodies1 As HybridBodies
Set hybridBodies1 = part1.HybridBodies
Dim hybridBody2 As HybridBody
Set hybridBody2 = hybridBodies1.Item("Auxiliary Geometry")
Dim join As HybridShapeAssemble
Set join = part1.FindObjectByName("Join.1")
Dim reference1 As Reference
Set reference1 = part1.CreateReferenceFromObject(join)
Dim hybridShapeFill1 As HybridShapeFill
Set hybridShapeFill1 = hybridShapeFactory1.AddNewFill()
hybridShapeFill1.AddBound reference1
hybridBody2.AppendHybridShape hybridShapeFill1
End Sub