You can use custom field if its for dashboard.

Hi, 

What sort of custom field should I create? The pie chart widget seems compatible with only a few variable types, and I am not sure how to customize the field. To clarify, my survey uses sliders to collect numeric data for various categories. I am wanting to visualize this numeric data as a pie chart, but am unsure how. I would ideally want a pie chart that shows which percent of the sum each category’s value represents, but the pie charts seem incompatible with the way my data were collected. I am wondering how I can adjust the data to be able to use the pie chart visualization. 

Thanks for the clarity. For this, you can use the Measure groups.

Go to settings→ dashboard data→ Add Field Group →Assign a name

Then, add all your categories one by one. Hit the save button.

Add the pie chart widget, select the count metric, and in the dimension select the new field group you created. 

Thank you! This worked. The only thing is that because the fields in my Measure Groups were already custom fields created for the survey to aggregate subcategories, I had to use the SUM metric instead of the COUNT metric.

Your solution solved a problem that even support was stumped on. Thank you!

Great. Happy to help!