Auto upgrading multiple single orders to a bundle

Topic summary

A one‑product Shopify store wants the cart to automatically convert multiple single-bottle items into the corresponding bundle (1-, 2-, or 3-bottle). The goal is to prevent customers from paying more for separate singles when a bundle exists at a better value.

Requested behavior: adding two single bottles should auto-convert to a 2-bottle bundle; the post also states two singles should upgrade to a 3-bottle bundle, which appears ambiguous and may be a typo (possibly intended for three singles → 3-bottle bundle).

Key question: can this be achieved using Shopify’s “Buy X Get Y” automatic discount feature?

Status: no confirmed solution or steps provided yet; the thread remains open with an unresolved question about feasibility and the exact desired trigger logic. No attachments or code provided.

Summarized with AI on January 5. AI used: gpt-5.

We are a one product store. We offer in bundles of 1, 2 and 3. Is it possible so that if a customer adds two single bottles to their cart, they will automatically be upgraded to a 2 bottle bundle? Same if they order 2 single bottles, they will automatically get upgraded to the 3 bottle bundle.

Can this easily be done using the Buy x Get y automatic discount?