Negative figure in GSTR 3B

Doing online trade on amazon. I have some inter state sales and sales returns. Now, as per law I need to show State wise sales in box 3.2 of GSTR 3B namely Inter-state supplies. I have some negative figures from some states because of sales returns.

So, my query is how to show the negative figures in GSTR 3B in box 3.2 ?

Thanks & Regards