The only way to an detach a quote is to either copy it or revise it from within the Main Quotes Menu. Go the main Quotes menu, find the quote, open it and click on Options-->Copy Quote. This will copy the Quote and make it Job independent. You can then attach it to another Job later when needed. This will of course create a new quote number. Alternatively you can click on Options-->Reset to Draft, then approve it and click Revise. (also from within the Main Quotes Menu, not from within the Job itself). This will cancel the original quote and create a new one without a Job attachment but he number will be the same except for the version number, e.g QT00023-2.