Editing

Tagging can be done using the tag panel.

Multiline editing

A fast way is in place editing using  the multiline facility.

In the column you which to modify:

• click on the first line
• shift/click on the last line
• press F2

Expressions

You can use expressions while editing starting with an equal just like Excel .

To change:
I. Allegro
II. Adagio
III. Allegro

to:

Concerto for trumpet in E Op.17 - I. Allegro
Concerto for trumpet in E Op.17 - II. Adagio
Concerto for trumpet in E Op.17 - III. Allegro

Multiselect all the files and edit the name (F2 for in-place, or use the Tag Action Window) and type:
=Concerto for trumpet in E Op.17 - [Name]

You can undo (Ctrl+Z) if it doesn't work like you wanted.

Source