how to make pie chart of categorized things?

Hi folks,

I was going to use gnumeric as a way to keep track of my expenses.

The attached screenshot shows the trouble best, but here's a description:

The plan was to create one row per expenditure, with some classification
tags, so I could then make pie charts and such to keep an eye on things.

Unfortunately the pie chart doesn't do what I want: it give me one slice per
row, rather than one slice per category.

Any pointers to the easiest way to get what I'm going for?


Attachment: bad_pie.jpg
Description: JPEG image

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