Interprets child element as string and extracts the defined sub string from it. If child element returns an array, an array of sub strings is created by the operator.
- Label: Label of column.
- Start: Start for sub string.
- Length: Length of sub string.
- Ellipses: Add ellipses if original string is longer than defined substring.
Start at 3, grab 4 characters and add
... if the original string was longer than 7 characters.