code: public static base_response add(nitro_service client, policyexpression resource) throws Exception {
  		policyexpression addresource = new policyexpression();
  		addresource.name = resource.name;
  		addresource.value = resource.value;
  		addresource.description = resource.description;
  		addresource.comment = resource.comment;
  		addresource.clientsecuritymessage = resource.clientsecuritymessage;
  		return addresource.add_resource(client);
  	}
docs: Use this API to add policyexpression.