Cordless-platform filter (DeWalt 20V Max vs Milwaukee M18 vs Makita LXT), how do you set it up in Magento?

This is the single highest-leverage feature for any tools store with cordless products. Contractors lock into a platform (4+ batteries = $400+ sunk cost); after that they buy the matching brand for life.

The Magento setup:

• Custom product attribute cordless_platform (dropdown: dewalt_20v_max, dewalt_60v_flexvolt, milwaukee_m12, milwaukee_m18, makita_lxt_18v, makita_xgt_40v, ryobi_one_plus_18v, ridgid_18v, none). Indexed for Layered Nav.
• EAV swatch presentation so the filter shows brand-color chips, not text dropdowns. Keeps Layered Nav under 200ms on 40k-SKU catalogs.
• Sticky “My platform” preference saved per customer (cookie + customer attribute if logged in). Buyer picks “Milwaukee M18” once; from then on every category, search, and PDP recommendation pre-filters to M18-compatible.
• PDP cross-sell rules: when a customer views a DeWalt 20V Max drill, show only DeWalt 20V Max batteries / chargers / combo kits in “Goes with this”.

Acme Tools runs this pattern cleanly. Conversion lift on PDP recommendations runs 15-25% once platform is set. Cost to build: 30-60 dev hours at $25/hr.