hi, frnds me excel me counting krna chahta hon for example mery pas bhut sy items hai jin ko me ne sale kiya hai ab me pory month ka hesaab krna chahta hon lets suppose me ne 1 bill me koi jeez sale ki hai pir wo jiz me ne 4,5 bills k bad 1 or bill me sale ki hai to aisa formul chahta hon jis me 1 he cell me us item ki quantity likon ko automatical 3rd cell me add ho jy lakin jis cell me ne likha hai wo cell zero ho jy ...............