There are various ways to do this depending on quite what you want to
do. A common answer is to use ODBC. If you haven't got OBDC drivers for
your Cobol database you will find plenty of suppliers on the net. they
often require a little bit of configuration to get working.
You then use the DAO add in to use SQl to extract data from your Cobol
database directly into Excel.
Or you can export a CSv file from Cobol and open the CSV directly in
Excel.
Hope this helps to get you thinking in the right direction.
Cheers