APPLY CAGE MODIFIERS

 
When you decide to freeze the deformed object in it's current form you can finalize them by the "Apply_Cage" button at the bottom of the Sketch N' Cage menu.
apply

After pressing "OK", a new menu will pop up. Select "Apply All Cage Modifiers" and press "OK" again.

apply2

This will apply all the Cage modifiers in the stack.