FORM GST PMT-06 contains separate columns for CGST, IGST, UTGST and SGST which shall deposit the amount to the respective account of the government though paid through a single challan, therefore, CGST, IGST, UTGST and SGST can be paid together in a single challan.
(ICAI FAQ PUBLICATIONS 06-09-2017 TAX PAYMENTS, INTEREST, PENALTY AND OTHER AMOUNTS: FAQ NO. 28)