Move Customizations from One layer(ISV) to another(VAR) in Ax7?

(Other than creating a new model with similar references and moving files physically to the new model's location).what can be done without affecting the base layer?

i tried changing the layer code in descriptor file in the model i have created. it changges to VAR. but how to check whether the base layer doesnt changes to var only my customizations should move to VAR layer.. any suggestions pls