Create a single duplicate of a model

Select the model in the list.

Right-click the selected model and choose File actions > Duplicate from the menu.
Or
Select the Models > Duplicate model menu option.
Or
Click in the toolbar.

In the Duplicate window, enter the model number in the New model number field.

Change number of the Reference model for the new model, if desired.
By default, this will take the name of the original model selected for duplicating.

Adjust the Model description for the new model.

Check the Use final parameter estimates from reference model box to update parameter estimates in the new model to the ones estimated for the original model.

After pressing the Duplicate button, a new model is created and opened in the editor.