Proposals your workspace prepared in Omega Prime for its own customers: who opened them, what they decided, and where an approved one stands in Omega Logic. The customer sees the proposal, never your cost or margin.
BOMs your organisation has been asked to price. Open one, take the CSV into your own system, and send the quote back here — the customer sees it on their project.
Quote requests you filed from a BOM, and what came back. Accepting reveals your contact details to that supplier and to nobody else.