I tend to use various publishing terms frequently. Here are some definitions:
COGS: Cost of Goods Sold. Includes PPB, Plant and Royalties
PPB: Paper, Printing and Binding (and almost anything else that comes on the printer’s bill, plus freight into your warehouse)
Plant: Those costs of preparing an edition for printing for which the total expense does NOT change with the number of copies sold or printed. Examples include design, editorial and proofreading.
RFQ (or RFP): Request for Quotation (or Proposal) — the document you send to printers asking for their bid. It will include all specifications for the book to be printed, including trim size, quantity, paper type, cover, and all the rest of the printing, packaging and shipping details.
I have many more of these on the Reference Desk section of my site. Enjoy. (Or something.)
You mention in a later post “RFQ.” My company uses “RFP,” but regardless, it might still be worth adding to your glossary.