How to import parts of the filename into the tag?
Importing tags from filenames and directory names can be done by using the 
Converter > Filename - Tag.
The basic concept is the notion of a format string which describes the structure of the name to import from. The format string is built of either standard text (e.g., Music), placeholders (such as %artist%, %title%, ...), or backslash characters \ that denote directory structures.
Here is an example that imports tags from a file name 02. Four Ton Mantis.mp3
%track%. %title%
Please note how the format string completely resembles the structure of the file name.
How to import parts of the folder structure into the tag?
It's also possible to import information from the directory structure of the file path where the backslash character is used to mark the different folders.
For example, the information from the path
Amon Tobin\[2000] supermodified\02 - For Ton Mantis.mp3
can be imported using
%artist%\[%year%] %album%\%track% - %title%
Of course, sometimes it's also needed to omit some information that should not imported to the tag. This can be done using the %dummy% placeholder for the unneeded part of the file path.