GS:Stage Wave Window
From coolearthwiki
Staging is the operation where the user picks the assigned inventory for the production order and stages them in an area for the loading phase of the transaction.
Staging in accomplished by using the Whistle Dashboard to set up the Stage orders, or from inside Whistle with the appropriate settings.
The Stage Wave window works pretty much identically as the Stage Window on the Shipping menu. See the documentation for that window for details.