To generate Gerber & NC Drill files from OrCAD (Cadence Allegro) PCB Editor, Open the native file (.BRD) in OrCAD PCB Editor;
Gerber Files: From the Editors window, go to Manufacture > Artwork; on the Artwork Control Form, click on the General Parameters tab to make active and then confirm the following settings:
Device Type ~ Gerber RS274X
Film Size Limits ~ 14 x 16
Leave remaining default settings to keep outputs consistent. Now, click on the Film Control tab and choose Select all from the bottom of the Available Films section and then Create Artwork. Choose OK to close this window. The artwork (Gerber files) should now reside in the originating folder (where your .brd file is located).
NC Drill File : From the Editors window, go to Manufacture > NC > NC Drill. The NC Drill dialog box will open. Confirm that the root file name is present (board name.drl) and choose 'Auto Tool Select'. Leave remaining default selections. Click on the Drill button to generate the NC Drill file. The NC Drill file should now reside in the originating folder.
Please review attached document Allegro OrCAD PCB Editor_Gerber-Drill Output.pdf for screenshots and easy reference.
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