Single flat file to the bank vs individual payment files

Hello

We are working with Wells Fargo to start sending all payment files (ACH , checks, wires) to them.

So when i did my test, i used the generic US NACHA FORMAT from Oracle and delimiter_based flat file for outsourced checks.   However the bank is pushing back saying they do not want to get individual files for each kind of payment (ie ACH, outsourced checks, wires, checks) but once single file that would combine all payment types into one file. How do i achieve that requirement? they want the file to be flat file (delimiter_based).

How do i achieve that?