When a production is opened you can change which files are in the production with this function. You can also create a new drill or create a continuation drill of an existing drill in the production. This is handy when you have finished one drill and want to move on to the next.
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Pyware Customer Support wrote: Aug 18, 2016
Great question, Bruce.
There's intentionally no "Delete Drill" option in 3D. You'll want to go to your Documents/Pyware 3D/Drills folder and manually delete the extra files you no longer wish to keep.
Bruce Corrigan wrote: Aug 16, 2016
How do I remove drills from my files?
I have drills for many songs that we have done over the past three years that I don't need and would like to remove them so that I don't see all of them when I go to open a drill. Especially since I have several saved files of draft 1-2-3-4 etc..