...
...
Staff Notes
Notes that contain processing information for staff do not display in the OPAC. Staff notes pertaining to the whole copy are recorded in the subfield $x of the 852. Use subfield $x of the 866, 867, or 868 for notes referring to that holdings statement. Several notes may be recorded for a single copy, but each should be in a separate $x subfield. When recording a note containing processing information for staff use, refer to Abbreviations Used in Notes to select appropriate abbreviations. If there is no abbreviation, record a concise note in your own words.
...