Use variable from main process in subprocess

Insert a step of the type 'Execute Javascript' Run this script:

Note: enter the name of the variable of the main proces where is says: VARIABLENAMEHERE

var url = #REPLACE-STEP-LINKONLY#; var processInstanceId = +url.split('processInstanceId=')[1].substr(0,6); return WorkflowInterface.getVariableValue(processInstanceId, 'VARIABLENAMEHERE');