No ... you cannot do any ammendment pertaing to fy 2017-18 if filed the sept18 return .
But as there was recommendation in 31 council meeting that ITC can be claim upto 31/03/2019 , might be portal will reopen for amendment for same . but as of now its being closed hence can wait for Notifications to be issue
The Central Board of Indirect Taxes and Customs (CBIC) through a gazette notification issued an order stating that ITC claims for the maiden year of Goods and Services Tax (GST) roll out (July 2017 to March 2018) will be allowed till March 31, 2019. GST was rolled out from July 1, 2017. Besides, the CBIC has also allowed businesses to correct any error or omission in filing of final sales return or GSTR-1 for the period July 2017-March 2018. Now businesses can correct the errors in the returns to be filed for January-March 2019.
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