Go to Masters > Marg Setup > Control Room > Search > Other Head > Ask 1/2/3 Other Add/less (Eg. Freight, Packing Etc.) on Billing (3)
2)- Default in +/- of 1st Other (Define %of Surcharge)>(+)
3)- Default in +/- of 2nd Other (Define %)>(+)
3)- Default in +/- of 3rd Other (Define %)>(+)