Section 61(6)(a) in Punjab Goods and Services Tax Rules, 2017
(a)Part A of the return in FORM GSTR-3 shall be electronically generated on the basis of information furnished through FORM GSTR-1, FORM GSTR-2 and based on other liabilities of preceding tax periods and PART B of the said return shall be electronically generated on the basis of the return in FORM GSTR-3B furnished in respect of the tax period;