For ease of processing and consistency, each copy should have its own Holdings record. Copy information should be part of the 852, using (A), (B), etc. at the end of the call number (including for LC call numbers). The 852 |t and the "Copy Number" field in the item record are not to be used. When we have multiple copies of multi-volume title, the call number should be formatted:
GC7.M9702V.1815 (A) v.2, pt.3
where the call number and copy information is in the Holdings record (852 field), and the volume designation is in the item record.