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Next, you will have to include a singular obligatory Ship design entity below the entity Ship configurator. That means that Ship design will always be included in a solution (below Ship configurator).

• Right-click on the Ship configurator entity in the Workbase. Select Taxonomy > Include new Entity or press Ctrl+F3
• In the Entity Editor, select Entity type Singular obligatory and name the entity Ship design and press OK.

There need to be added some more enitities entities now. These will be optional entities.

• Select the Ship configurator entity and press Ctrl+F3. Call the new entity Mass calculation and select Entity Type Belongs to group of single optional Entities and press OK.
• Do the same for the entities Intact stability calculation, Data to Word report and Data to Excel.

Belongs to group of single optional Entities will result in such an entity to be shown to the user in a selectiuon window at the start of a solution run.

3    Changing entity type and sequence

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