Right-click the selected model and choose File actions > Rename from the menu.
Or select the Models > Rename model menu option.
Or click 
in the toolbar.
Edit the model number in the New model number field.
Use the following options to help maintain connections with the renamed model.
Also rename associated results files — Check to update any results files with the new model number.
Also rename existing $TABLE files — Check to update any table files with the new model number.
Change model name in $PROB / $TABLE / $EST sections — Check to update the model’s number within sections of the model file itself.