Excel sheets extraction using BODS

Dear experts,    

  I have a situation where I get an excel workbook with 5 tabs (Each tab has different name like cost, price, abc, xyz,mnf….). The tabs/ sheets could have new names always, but the sequence would always be same.

So, I have separate data flows built on how to extract 1st sheet, 2nd sheet and all subsequent sheets.

But the problem is how do I send the sheet number to the DF (I checked the number box under the format tab of the DF for excel source). Can someone please help me with the script on how to send the sheet number or how to read the sheet name into a global variable and pass it on to the excel source.

I'm using BODS 4.0.

Thanks for your time and efforts

-Amit