Dvat return online - very urgent

Perhaps your topic is related with DP - 1 Filing.

I means : You have to mention all such product category which constitute 80% to 100% of total sales volume.

suppose an entity deals in 10 different types of product categories , category 1 and 2 constitute 90% of sales volume remaining 10% is out of 8 other categories. In this case you are required to mention only category 1 and 2 details.

No, my problem relates with DVAT-16

From this FY (2013-14), you need to submit stock category wise detail in Form DVAT16. Here you need to enter the item you sold during the quarter from the drop down list in column no R3, after that you need to enter the percentage share in the quarter for which you are filing the return. You need to enter commodities or items till you reach minimum of 80%, and can leave the rest. Hope this will solve your problem.