A useful tool for Sales administrators is The Actions report.
Amongst other reports, there is a report for ascertaining which vehicles have costs against them that have been un assigned.
Go to Sales Admin Toolkit>reports tab>Action Report>select the branch> tick the branches you wish to find a report for, or tick all the branches. Click report. Look for the column Un Assigned costs and this will show all vehicles with un assigned costs. Indicated by a tick in the box.