You can add user dictionaries onto the Lingvo Bookshelf. You can create user dictionaries yourself or obtain them from other ABBYY Lingvo users (e.g. by downloading dictionaries from the www.LingvoDA.ru).
To add a user dictionary to the ABBYY Lingvo Bookshelf, select Tools>Add Dictionary… and in the dialog box that opens, select the required dictionary file and click Open.
Working with User Dictionaries