All People, vehicles, and ROs should be searchable, Each one should be on a tab. underneath should be a selectable table with all of the people, vehicles and ROs. above the tables should have a search box that only searches inside that tab.
/people\/vehicles\/ro\
At this moment, the all of the ROs, vehicles, and people will be listed. you can click on all of the tabs and it will have a list of all of the database entries.
if you click on people, and select joeseph palmer, then the line that joseph palmer would be on will change colors, and will no longer be selectable. The tabs will change to
/Joseph Palmer\/vehicles\/ROs\
You will then have to select the vehicles tab, and select which vehicle is being serviced. You can also click on the vehicle that is being serviced, and find all associated ROs that way (not dependant on selecting a customer, just in case they sell the vehicle, it will still have all of the service history).
the tabs will now look like this
/Joseph Palmer\/1999 VW Jetta TDI\/ROs\
the flow for the ROs will be the same. once you've selected the RO, a new tab will show up at the top For the selected RO
/Joseph Palmer\/1999 VW Jetta TDI\/RO 2998\/Selected RO\