RFP360 makes this very easy to do "on the fly".
After you have uploaded, or drafted your Proposal, click on the question you wish to re-arrange, then go to the Details tab in the Action Menu to the right of the page. The Details page shows a history log of all edits done by whom/when, make internal comments or notes on a question, and move to a different section.
Click on the drop-down arrow to show a list of available sections, select the destination and click the orange Move button to complete the action.