Divide data between lines by Criteria

I have data pulled from the server which has a value, a date but can differ by an attribute named Descr. My ideia is to specify the Descr and to create multiple lines automatically

`var chart = c3.generate({`
`bindto: element,`
`data: {`
`json: data,` ,
`keys: {`
`xFormat: '%Y%m%d',`
`x: "Data",`
`color: 'GrupoCor'`
`value: ["Valor"],`
`**name: "Descr"**`
`}`
`}};`