When you Import Termbase Data, you can also create an Import Definition.
Open the Catalog view.
In the navigation tree, under the termbase name, select Import.
Select Catalog > Create... from the menu.
Select Save import settings when closing the wizard box.
To just create the import definition and not import, de-select Run import before closing the wizard.
See Creating an Administration Termbase Object to start the wizard for SDL MultiTerm Administrator.
Viewing Import Definition Descriptions