I'm writing my invoices like this:

\environment e-invoice
\startInvItem[amount=123] bla bla 1 \stopInvItem
\startInvItem[amount=456] bla bla 2 \stopInvItem

If anybody is interested (e.g. for using it, making a module or
wikifying), then I can send my files (no time to do it myself...)

There are also calculations:

\environment e-calculation
\startCalcItem[title=Title 1][hours=123]
  Do this and that, bla bla bla.
\startCalcItem[title=Title 2][hours=456]
  Do something else, a lot of work.

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