List Selection

Hi, I a evaluating Mendix for suitability for some applications and I have one that I am beat on​​​.   First Screen Select the Truck that will be using the App   Second Screen Two lists to be shown.   – First list is all staff available for duty   – When staff are chosen from first list, they appear in the second list to show selected crew A button on the screen that when clicked creates an record of the current staffing, including a link to the truck selected in the first screen and the staff assigned to the second screen.   I have tried using helper objects to use associations, but this appears to be particularly difficult as it needs to work offline.   Anybody got a sample/demo that demonstrates this behaviour?  
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