You can add a glossary or add to an existing glossary in a project through the Project Terminology tab.
To import a glossary or to add to an existing glossary:
The Project Terminology tab appears.
Reference: Project Terminology Search and Sort.
The Import Glossary dialog box appears.
Tab delimited text file (.txt)—Wordfast Classic and Wordfast Pro 3 format
Term Base eXchange (.tbx)
Create New Glossary to import the first terminology file for the project
Import Into Existing Glossary to add terms to the existing glossary