No, The tool does not allow working on DDT or DFB type definition.
Also Excel tool attributes management has the following limitations:
1. Wrong or inconsistent values are not checked and Unity Pro rejects them during the import.
2. Unsupported attributes are not checked.
For example, setting Time stamping attributes on an INT type variable is not allowed, but it is
not checked by the Excel tool. Unity Pro rejects those attributes during import.
Also Excel tool attributes management has the following limitations:
1. Wrong or inconsistent values are not checked and Unity Pro rejects them during the import.
2. Unsupported attributes are not checked.
For example, setting Time stamping attributes on an INT type variable is not allowed, but it is
not checked by the Excel tool. Unity Pro rejects those attributes during import.