Shopify - Filtering Work (Product Selection/Non-Selection)

On our website www.juicebitz.co.uk we have added filters for our USB Cables, so that customers are presented with "Brand" and "Compatible Model". At the moment, if the user selects "For Apple", like this: https://www.juicebitz.co.uk/collections/usb-2-0?filter.p.m.custom.compatible_brand=For+Apple

We have that many models for all mobile phone manufacturers, that we don't want to be shown like the example above, but only the matching products under that Brand should be shown.

For instance - if For Apple is selected, only iPhone & iPad models should show, no Samsung, no Huawei etc etc.

We do have the Metafields in place for the filters as you can see in the images attached.
We also have Product Tags which could help assist with the implementation.

Thanks for looking.

JuicEBitz®