Just add a new field with this formula (adapt it for your needs):
CASE
WHEN reliability >= 0 AND reliability < 20 THEN '0 - 19'
WHEN reliability >= 20 AND reliability < 40 THEN '20 - 39'
WHEN reliability >= 40 AND reliability < 60 THEN '40 - 59'
WHEN reliability >= 60 AND reliability < 80 THEN '60 - 79'
WHEN reliability >= 80 AND reliability <= 100 THEN '80 - 100'
ELSE 'out of range'
END
Then, select this field as dimension in your Pie Chart. Easy Peasy.
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