Distinguishing between billed and unbilled tasks

Hi,

I am trying to find a convenient and reliable way of grouping tasks (and 
subtasks) within taskcoach according to the invoice to which they have 
been added.

That is, I need to keep track of whether tasks have been completed (ie. 
the code written, tested and put into production, etc.) and whether the 
client has been billed for the work, and (most important) whether the 
client has actually paid the invoice.

These 3 distinct states may be separated in time by as much as a few 
months, so I don't always remember details about a given task/invoice 
when a client gets around to paying it.

So far, I've resorted to creating invoice-subtasks for each invoice, 
moving real subtasks under an appropriate billing subtask in the time 
between completing the work and receiving payment. It's a somewhat 
clunky and error prone approach.

How do you guys handle this? Is there some mechanism within taskcoach 
which could be made to support this work flow?

Any suggestions would be greatly appreciated.

-- 
Søren O.

"Oh, bother" said the Borg, "we've assimilated Pooh".

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