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Unable to bind Picklist to Add to Cart from HOMEPAGE

I must bind picklist selector to add to cart.

for example:

Form Block:
Pick Your Package (Picklist-Dropdown)

  1. Red Widget ($50)
  2. 2x Red Widgets ($100
  3. 3x Red Widgets ($150)
  4. Red Widget + Blue Widget

[ Add To Cart Button ]

what are the data-id perams to bind pic-list values to add to cart?

Has anyone have success binding picklist + data-id to add to cart?