Sales Order Approval- Gross Profit Margin % in Item Level

Hi,

I need to set Min. GP% for each Item in Item Master and in Sales Order GP % has to be calculated in Item Line Level(Found detail for this in Gross Profit Margin Percentage in Sales Order window), I need help to set Approval, if the GP% of a line level Item is more than or equal to that of Min. GP% in Item Master it'll go to "Approval1", if it's less than Min. GP% it'll go to "Approval2".

Thanks and Regards,

Jeyabalan