Model and track inventory for product bundles and kits using component-level math

Steps

1. Define each bundle as a virtual SKU with a bill of materials (BOM) listing component SKUs and quantities required per bundle unit (e.g., bundle SKU GIFT-SET-A requires 1x SKU-MUG + 2x SKU-COASTER)
2. Store available bundle quantity as a computed value: min(floor(component_available / component_qty_per_bundle)) across all components, recalculated whenever any component's inventory changes
3. When a bundle is sold, decrement each component's inventory by the required quantity per bundle, not the bundle SKU's virtual inventory
4. Push the computed bundle available quantity to each sales channel's inventory API immediately after any component quantity change to keep channel listings accurate
5. Handle pre-kitted bundles (physically assembled as a distinct SKU in the warehouse) differently: treat the pre-kitted SKU as its own inventory unit and decrement it directly on sale, with a separate WMS assembly workflow to replenish
6. Alert when a component's inventory drops to a level that would reduce bundle availability below a safety threshold, triggering reorder or reallocation