I think you need to define better what it is that you are trying to achieve. Try writing some code. Do you mean something similar to this:?
Type GraphicsPile Field a Field b Field c End Type Global TileGraphics.GraphicsPile = New GraphicsPile Type OtherType Field a Field b Field reference End Type othertypetypeinstance.OtherType = New OtherType othertypetypeinstance\reference = TileGraphics