Editing cost categories
You can edit your cost categories using the following procedure. Cost category names can't be edited. If you're using split charges, you can choose Uncategorized cost as your source value at this time.
To edit a cost category
Sign in to the Amazon Web Services Management Console and open the Amazon Billing and Cost Management console at https://console.amazonaws.cn/billing/
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In the navigation pane, choose cost categories.
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Select the cost category to edit.
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Choose Edit cost category.
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If you want the changes to retroactively apply from a previous date, choose the month you want the parameter changes to apply from.
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Make changes to parameters and choose Confirm cost category.