RMA & SO Quotes saved in history for reference

I have a customer with hundreds of Sales Order Quotes and RMA's in active data entry files.

The Quotes were never converted to orders and the RMAs were never received.

They would like to remove them from the "Open" files and place them in history for future reference.

Does anyone know of a way I can do this?

We were going to pdf them to paperless office (quotes) then delete the quote but the delete also deletes the pdf in paperless.

As always thanks in advance for your assistance.