Two ListParts on one Card Page with dependencies

Hi,

I need to add a Listpart to the Jobs Card Page, wich represents several departments involved in the job. A second Listpart should show the Job Tasks, but only those belonging to the department currently selected in the department Listpart. So when a different Department is selected, different Job Tasks are displayed.

I already have the function in the Card Page that would filter the Job Tasks according to the department selected, but how do I trigger it?

Any suggestions are welcome!