Through the Import templates page, under the Project settings menu, it is possible to edit Import template names and no-data values, activate/deactivate templates, see if data has been imported with them, and delete templates if they are not going to be used further.
Note that you cannot delete a template if data has been imported with them, but you can make them inactive in the Status column and they will no longer be offered for importing in the future, keeping your list up to date and tidy. Import templates management depends on your permission level.
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