SEC. TO BE MENTIONED ON RAISE OF MANAGEMENT CONSULTANT BILL

There is no such specific requirement.  However, if you so desire, you can include following:

Issued under Section 31 of SGST Act, 2017 & CGST Act, 2017, read with Section 20 of IGST Act, 2017Issued under Section 31 of SGST Act, 2017 & CGST Act, 2017, read with Section 20 of IGST Act, 2017

"Issued under Section 31 of SGST Act, 2017 & CGST Act, 2017, read with Section 20 of IGST Act, 2017"