Hi Hung,

I think I have perfectly understood your question.

The 2 options in the Optinest pp refer to the way holes are drilled. 

When a part has a hole on each face that align, “Opposite Drillings” either will maintain 2 holes (one on each face) or create 1 hole that goes through the part.

The Optinest pp will flip parts so that the machined faces are upper most. If a part has a hole that goes through from one face to the other “Through drillings” can put the drilling face onto the upper nested  face even if it has be set in Polyboard on the under face.

In both cases using the Optinest pp both faces will be exported into the same drawing.

When a cabinet panel has 2 separate machine operations on each panel face, you must not use the Optinest pp.

Instead use the DXF pp and set the “Tooled faces export” function to “One exported file per face”.

You will then have a folder with all the machined faces. Take out of the folder the second face of the double faced parts and load the remaining parts into Optinest.

This will create the nesting maps for all the parts but the double sided parts will only have one face machined.

Put the double sided parts back on the machine upside down.

Create some machine files with the second face DXF files and run them on the second face of the parts.

Hope this is helpful.

Best regards,

Ness