On the Custom Entity Types page, click Create Custom Entity Type, then select Model-based entity type.
Custom entity type creation dropdown
On the next panel, in the Custom entity type name field, provide a name for the custom entity type.
In the Annotation guidelines text area, provide instructions for how the model should identify values that you want to find. This is the first version of the model guidelines.
Panel to provide the name and initial guidelines for a model-based custom entity type