Any example to hit process model through dropdown value in Interface
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As Stewart mentions, you can certainly start a process asynchronously via the dropdown's saveInto, such as:
a!localVariables( local!options: {"Red","Blue","Green"}, local!selection, local!processStarted, a!dropdownField( label: "Dropdown", placeholder: "-- Select --", choiceLabels: local!options, choiceValues: local!options, value: local!selection, saveInto: { local!selection, if( local!selection="Green", a!startProcess( processModel: cons!YOUR_PM_HERE, onSuccess: a!save(local!processStarted,true), onError: a!save(local!processStarted,false) ), {} ) } ) )