create workflow rule based on specfic "bank" assigned to invoice Merged

Sometimes there are trust accounts (or simply separate bank accounts) where a business manager/trustee may sign but other banks for the same client entity where they may not. while this is not common or widespread, it exists and presently we cannot dictate separate workflow based on the bank assigned to pay from on the invoice. therefore, temporary workflow delegations must be coordinated and repeated frequently in these instances.