Edit: Insert File

Keystroke: Select from menu

You may insert various types of files directly into your DBT document. These include other DBT files, certain types of braille graphics files (.brg, .sig and .vim), Music files (.lim, .mid and .mus), and Microsoft Word and Word Perfect documents.

Other file types may imported, but you might have to experiment with a sample or test document.

Image of Insert File dialog described here.