How to caluclate retention amount in f-form sales

Hi, As per rules, a proportionate ITC availed shall be reversed for stock transfer out to other states. This can be calculated as [(ITC taken)*(stock transfer out against F form)]/[(stock transfer out against F form)+(Local Sales (gross value))+(CST Sales(gross value))+(Export)] Hence, out of total ITC taken in the tax period proportionate tax credit on stock transfer shall be reversed. Thanks, Swati