need to create one payment instruction for multiple internal banks for NACHA file to be sent to bank

Created NACHA file to be sent to bank,  have 50+ internal bank accounts.  Have created seperate PPR's for each internal bank which is creating a seperate payment instruction for each internal bank, Would like to group these payment instruction and send one file to bank. Found note 1287600.1 , is there any additional documentation ?

Thanks

Dennis