Yes. While the proposal is at the "Changes saved but not submitted" step, multiple people can work on the proposal at different times. To do so, search for the proposal name in the search bar, click on the proposal and then click the green "Revise" button. Be aware that CIM will not capture the names of who made changes to the proposal before it is submitted. Therefore, clear communication and collaboration between the proposal developers are key. Once the proposal is ready for submission, designate one person to click on the green "Start Workflow" button at the bottom of the proposal.