How can i create subgroups by holding labels on the doughnut chart?

[CrilloUrby]

Inside my doughnut chart i would like to create a function that clicking on a part of the chart creates a subgroup with the datasets (labels and data) and clicking another part creates another by removing the previous one and always putting the data. Now if i click it it creates it for me but it keeps the old names and only changes the dates. How can i do?
This is my code:

(https://github.com/chartjs/Chart.js/files/6599319/Nuovo.documento.di.testo.txt)

[CrilloUrby]

I did it