GST law does not have any special provision for loan and licensee units. Where the contract are in the nature of performance of job-work, these units can opt to follow the procedure laid down in section 143 of the CGST Act, 2017 i.e. the principal can send any inputs etc. to such units without payment of tax and the principal can clear the goods from the premises of such units if the principal declares these units as his additional place of business or where such units are themselves registered under section 25 of CGST Act, 2017.
[FAQ 4: Drugs and Pharmaceuticals]