Sir, in this regards, please refer Circular No. 37/11/2018-GST dated 15/03/2018. The relevant paras No. 11.1 and 11.2 is reproduced below
11.1 In many scenarios, exports may not have been made in that period in which the inputs or input services were received and input tax credit has been availed. Similarly, there may be cases where exports may have been made in a period but no input tax credit has been availed Page 6 of 8 in the said period. The above referred rule, taking into account such scenarios, defines relevant period in the context of the refund claim and does not link it to a tax period.
11.2 In this regard, it is hereby clarified that the exporter, at his option, may file refund claim for one calendar month / quarter or by clubbing successive calendar months / quarters. The calendar month(s) / quarter(s) for which refund claim has been filed, however, cannot spread across different financial years.
However, to be honest, I am not be to understand para 11.2. I request our experts to please clarify the issue that how to club and how to file the refund for quarters, as online it is for the month only.