Flat FILE SCHEMA HELP NEEDED urgently

RMG or EXPERTS,
Is it Possible in webmethods to create a FlatFile schema for a fixed lenght flatfile where Header and Trailer has record-identifiers at the beging of the their corrosponding records…and the each record in the body has record-identifier at end of the record.IF this is possible,please help.

For Example:

##HEADER01 233 4456 67
789560000K 455551
867860998789999999 002
uru 9999 84746 000474992
##TRAILER999003300000003

In the above fixed lenght flat file example
##HEADER,1,2,##TRAILER. are record-identifiers…please help

Thanks,
Saritha:sad: