Kashflow currently doesn't offer the equivalent of SAGE's Bank Payment option. Often there will be costs which come out of the bank, but need to be assigned to multiple nominal codes. Currently there are 3 work-arounds but neither are ideal. One is to setup the cost as a purchase invoice, which is unnecessary, and often there isn't an actual bill behind this. Alternatively, you can raise a journal to the bank, and whilst as an accountant this is straight-forward, for many clients/users, this is complicated enough.
The third option is to post all parts as separate payments, but this just clogs up the bank reconciliation screen, and isn't strictly correct.
I think this is a simple addition, where currently you can add a transaction, just give the user the ability to add extra lines to this payment. It will avoid the daftness of seeing loads of purchase invoices for immaterial costs, and make it easier for users to post costs directly to the bank.