To create a calculated field, you can combine the data of existing fields through simple expressions or MQL Operator Expressions.
A calculated field definition can contain either simple expression language or operator expression language. You can't use both simple and operator expression language in the same definition.
To create a calculated field:
In the corner of the Fields pane, click Add Field.
Select Calculated.
Enter the Field Name of the calculated field that you want to define. To specify a nested field, use dot notation. For example,
metadata.target.Use simple expression language or Operator Expressions to specify the Value Expression .
Click Save Field.
The calculated field appears in italics in the Fields pane.
To learn more, see Calculate New Data Fields.