SSIS Combine projects into one

Hello,

I have multiple SSIS projects that have been developed to provide checking information to various banks in the form of csv files from a SQL database.  Each project is self contained and functions very similarly to each other.

Steps:
1. Run a SQL Task to retrieve bank account numbers
2. For Each Loop container With Data Flow.
3. Data Flow = SQL Task to format check register information into specific bank provided schema, export to Flat file and save in a specific directory with a specific naming convention.
4. SFTP Client to send files to bank for import.

We have added banks along the way and now that we have 5 or so I want to use one stored procedure and call the different formats based on the bank.  I have the sproc with IF statements to identify the bank format and it runs as expected.  Now, I need to have the sproc run in (I assume) another for each loop prior to the main routine in order to determine which format to apply but I'm having a hard time wrapping my head around the process.

There are other issues I need to deal with such as picking the correct subdirectory to place the flat file in based on the bank but I want to start by getting the control flow consolidated first.  Any help is much appreciated.

Thanks,