re-invoice to reflect partial payment and late fees?

[accidental landlord]

1) I'm attempting to use gnucash for my rental property.  I started using the
invoice feature this month and sent a December invoice to the tenants that
included line items for RENT and WATER.  I just received a payment and
attempted to use the process payment feature.  However, the payment only
included the RENT portion and did not include the WATER portion. 
Additionally, the RENT was late.  Accordingly I want to re-invoice the
tenant to reflect that the WATER payment remains unpaid and that the
December RENT was paid late resulting in an additional line item for a LATE
FEE.  Ideally, I would like something like the following...

Invoice Date: 11/25/2008

Due Date: 12/1/2008


December RENT   ..............  $$$ PAID, thank you

WATER                ..............  $$$ OVERDUE

LATE FEE             .............   $$$


2) If this type of re-invoicing is not possible, how do I carry over the
unpaid WATER payment onto the January invoice?  Do I manually have to remove
it from the December invoice and re-add it to the January invoice?  Is there
some way to report/print a payment reminder that includes itemized amounts
from multiple invoices?

3) Can the payment terms be customized to automatically tack on a daily late
fee, If the invoice is not paid within a certain number of days of the due
date?

Thanks for any advice!
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