How to add the sum in a Webform Report? I would like to have the total sum of a number field in a report created with Webform Report.

How can I get the total sum of that column table?
Instead of using the Webform Report module, you can use Views and Views Aggregator Plus to display the submission data. You can use the aggregation function sum for the selected fields (to aggregate your webform submission results tables).

Credits: Waluyo Adi Siswanto.