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Hey, you can setup a python callback script which dynamically reference the parameters from your hda to the wrangle. Here's a quick example : listparm_hda = kwargs["node"].parm("list") list_hda = listparm_hda.multiParmInstances() children = kwargs["node"].children() for child in children: if "wrangle" in children: wrangle = children else: continue listparm_wrangle = wrangle.parm("list") list_wrangle = listparm_hda.multiParmInstances() i = 0 for parm in list_hda: p1 = parm p2 = list_wrangle[i] p2.set(p1) p2.expression() i += 1 Cheers,