so is there anyway i could update the other file by just using the other file?

sorry about the caps =/.. so could anyone help me about my problem? its actually a finals for my class.. Pls help me =/

SITUATION: I HAVE 2 EXCEL FILES ONE IS CALLED "MARKET AND THE SECOND ONE IS "PRODUCT" "MARKET" SKU Price Quantity 123606 $295.00 8 123606 $295.00 8 124258 $149.95 85 124258 $149.95 85 123849 $149.95 116 123849 $149.95 116 112060 $99.95 0 112060 $99.95 0 123883 $79.95 2 123883 $79.95 2 124469 $34.95 ...