Using Convert → Tag - Tag, contents of tag fields can be composed by other fields content. This converter can also be used for copying the content of one tag field to another tag field.

There are two special field names, _FILENAME and _DIRECTORY, which target the file name and the directory name, respectively.

You can use Format Strings and Placeholders and Scripting Functions as format string to format the content of the specified field.

See First Steps → Copying one Field to another Field for an example use case of this converter.