Filter the variable product
It’s possible to create a product for just one case type, or just one brand. When creating the product you have to select which Brands, Models and Case types you would like. This acts just as a filter for Product Updates. When you select Apple as brand, all models and all case types, the Product Updates page will only suggest creating variations for Apple. When you select all brands and models but only transparent soft cases, Product Updates will suggest to only make a transparent soft case for all brands and models.
Don’t forget that if you enable ‘Automatically add brands’ or ‘Automatically add models’ the Product Updates page will also suggest to add the missing brands and/or models. If you wish to make use of these filters you have to disable the functions to automatically add missing data.