After adding a new subfield to your Termbase Definition (structure), for example a field nested directly underneath another field, you cannot add this field to you entries. The field is visible for selection but when you click on it nothing happens or is displayed after saving the entry:

NOTE: Starting with MultiTerm Desktop 2017 the Default Layout has been enhanced to support nested fields. Please visit this article for more details: Nested termbase fields are not visible in legacy layouts (e.g. Full Layout)

Create and use a custom layout and Input Model

Note: For this example the file-based termbase Printer.sdltb from the SDL Trados Studio Sample Project is used and a field named Source is added to an existing field named Illustration.
 

Adding the new field to the Termbase Definition

1. Open SDL MultiTerm Desktop.
2. Go to File > Open Termbase and select Printer.sdltb.
3. Click on Termbase Management on the lower left corner.
4. Right click on PrinterTermbase > Definition.
5. Choose Edit.
6. Click Next until the Field Display dialog appears in the Termbase Wizard
7. Add the subfield Source to the field Illustration, by right-clicking on Illustration
8. Click Next > Finish.

 

Creating a custom layout and adding the new field

1. Go to Printer Termbase > Layouts.
2. Create a new Layout via Home > Create, or copy and modify existing layout: right-click on a layout, select Duplicate. Right-click again and select Edit.
3. On Step 4 of 4 of the Layout Wizard right-click on Entry Level and choose Illustration.
4. Right click on Illustration and choose Source with a double click to add it as a subfield:
   
   
    

When adding terms or modifying them, make sure you have chosen your new layout under Home > Display.
 

Creating a custom Input Model

1. Go to Printer Termbase > Input Model.
2. Create a new Input Model via Home > Create, or right-click on a Input Model and select Create.
3. On Step 2 of the Input Model Wizard right-click on Entry Level and add all required fields you want to see when editing an entry including the for this example Illustration.
4. When Illustration is added, right-click on it and select/choose with a double-click the field Source to add it as a subfield:
5. Click Next/Finish until the Wizard is closing. 

When adding terms or modifying them, make sure you have activated/selected the Input Model and the Layout in the ribbon Home > Display.

The SDL Development team is aware of this behavior and is working on an enhancement. Changing the original Termbase Definition that was build when creating the termbase also requires an additional manual change of the Layout and Input Model. Until a permanent solution is in place, use the workaround described below.