Set CrossSite Loookup (multivalue) with WorkFlow


I have a list ( List_Documentation ) with a required field lookup_Company (pointing to t_Company, field Title ) and I need to create a new item in List_Documentation with a workflow.

While I have managed to set the the lookup value, if it is a single value field, I cannot find a working solution if the lookup field is a multivalue field.

Could you help please?

thanks and regards,