flat file extraction

Hi friends

I have situation were i have uploaded the data from flat file in to basic cube . the flat file contains POS data .

the flat file contains feild barcode number without material . which is assigned to 0ean/upc which is used EAN no in other cubes also .my problem after uploading the flat file with ean number to cube and create a multicube . can i link this ean number to material in the other cube . i mean after loading the data in cube . and creating query when user enters a ean number he should be able to see the material accoring to ean number in the flat file with sales data . is there any way . please let me know if there is something which need to be done . all answers are apperciated and rewarded to . so plz . waiting for your replays . thankyou all in advance