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A) a catalogue number ie the number i have already put on the CD case so that i can find it. EG. When i turn to album view of title I can see this catalogue number, or, in Record properties box
On the "library" tab there is a "reference #" that is automatically generated by OCD based on when you entered the recording. By clicking the arrow directly to the right of this number you can enter a custom number. Alternatively, to the right of this entry on the same tab is an entry for "location". You could enter your catalogue number here as well. Both can be displayed in the "Album Page" view. You can customize the "Album Page" by right clicking on the page and selecting, well, "Customize View".