My_Custom_Model_Product

Product.php

class My_Custom_Model_Product extends Mage_Catalog_Model_Product{
    use My_Custom_Trait_Extension_A_Model_Product, My_Custom_Trait_Extension_B_Model_Product;
    
    public function doSomethingCustomerSpecific(){
        //here we do smth customer specific
        // AND now it's possible to use methods from traits -
        // it means - from Extension_A and Extension_B Product models
        $this->fixSomethingByProduct();
    }
    public function getSomethingFromSomewhere(){
        //Call method from Extension_A_Model_Product
        $this->transformProductDescription();
    }
}