Same Record Key and FD for multiple VSAM files (of same structure)

Hi,

I'm writing a COBOL program which accepts 5 KSDS files and extract
data into a single file. All the files are of the same type and have
same data fields with values from different sources.

I am able to do this for 1 input file. But I'm having problems with
the Record Key Clause and FD for 5 files.

Since the files have same struction I'm using"

RECORD KEY IS NCB-D100

How can I do this for 5 files?

And, I'm using a copybook for the FD:

FD INP-FIL.
COPY BCBSECR.

I want to use the same copybook for all the 5 files.

Help required.