gst rate on jobwork

AS I HAD DISCUSSED WITH EXCISE OFFICER, HE OPINES THAT THERE'S NO GST APPLICABLE ON JOBWORK. AS PRINCIPAL WILL ADD THE COST OF JOBWORK IN HIS PRODUCT VALUE HENCE INDIRECTLY THERE WILL TAX PAID THROUGH HIS SALE.

Whether we can send the goods for jobwork to unregistered jobworker out of the state without IGST tax ?
whether we can send goods for jobwork to registered jobworker out of the state without IGST tax?
Can we send goods outside the state to our own branch which is registered in that state for jobwork without charging IGST as this is not stock transfer but goods are sent for jobwork ?
Please clarify. Thanks.