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Step 3 of the launch path. Two halves: get the stock you own into TWICE, then build the offers customers actually buy. Do not start until step 2 is finished. Imports attach to locations, attributes and tax rates, and an import run against a half-built foundation has to be redone.

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Get your stock in

Where your data comes from decides the work. From TWICE 1.0, you export and reshape — the 1.0 model does not map one-to-one onto 2.0 stock items and SKUs, and that mismatch is where migrations go wrong. From a spreadsheet, test ten rows before running the whole file. From nothing, you register as you go.
A guide for getting your stock into TWICE, covering all three sources, is in progress. Until it lands: Import inventory from a CSV, Register stock items, Register from photos, Import customers. For 1.0 itself, see support.twicecommerce.com.
Done when: your stock is in TWICE and the count matches what you exported.

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Build your first listings

Inventory is what you own; the catalog is what a customer can buy. They are deliberately separate — one listing can draw on stock at several locations, and one unit can be offered as a rental, a sale, or both. Build one listing end to end first, as the pattern for the rest. Then price it, decide its limits, and group it the way a customer would browse.
A guide for building your first listings is in progress. Until it lands: Create and publish a listing, Set up variants, Price a listing, Build a price table, Build a collection.
Done when: a listing shows correct availability for a real date. That is this step’s real finish line.

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Connect stock to listings

The part that catches people: a listing’s stock is not a field on the listing. The Variants tab shows an availability number that reads editable but is derived — the actual binding lives in a fulfilment rule. A merchant who does not know that cannot add stock to a new SKU.
A guide for how stock binds to a listing is in progress and is the highest-priority gap on this step. Until it lands: Control what stock a listing draws from and the stock items concept.
Done when: you can add a new SKU to an existing listing and see stock register against it.

Launch TWICE

The whole path, in order.

Set up the foundation

The previous step, which this one depends on.

Make it sellable

The next step: taking money for what you have just built.

Inventory guides

Every inventory task, in full reference detail.

Catalog guides

Every catalog task, in full reference detail.