“””””” Where you delete the inverted connection curves and the cushion then closes with the edges”””””

That is a new feature of v5 where you can delete model features like fillets and recover the underlying object.

So i selected all the current fillets (selected the larger surfaces then inverted selection:Michael)

Then “right click” on the delete button

This is in the beta release notes but is not documented yet, i believe….

See the explanation here:

New RemoveAndFill command - use Shift+Delete keyboard shortcut or Shift+click or right click on Delete button to invoke ACIS Remove component that deletes faces and then heals the resulting openings by extending and intersecting surrounding faces: