Hi Andy,
Thanks for getting in touch. Can I suggest in the short term you take a look the category tool within the quotes that allows you to group your quotes or filter them quickly. This could help you to manage different versions of quotes and track what stage they are at.
The other alternative would be to simply edit the Quotation reference so that you can track which version of the quote you are currently working with. If you wish to duplicate the quote to make amendments, you can do this using the 'Copy' button in the top right hand corner of the screen.
Many thanks