I have updated the cascading dropdown solution to support multi choice in all positions. Refer this article for setup instructions and background information.

To use multichoice on the select, you must use a multiline plain text field as “placeholder”, and address the field like the field “ThisListField2” in the “spjs.casc.init” function:

spjs.casc.init({
	lookupList:"NameOfYourList",
	lookupListBaseUrl:"BaseUrlOfYourList",
	lookupListFields:["LookupListField1","LookupListField2"],
	thisListFields:["ThisListField1","ThisListField2:multi"],

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Alexander