Split customer shipment

Splits a Fulfil customer shipment by moving some of its line items into a new shipment. Use it when part of an order ships separately, for example when one item is on backorder and the rest can go out now.

Inputs

• Customer shipment ID (required) — the Fulfil customer shipment to split. Map this from the order data in your Flow.
• Lines (required) — a JSON array describing which line items move into the new shipment. Each entry needs:
  • shopify_line_item_id — the Shopify line item to move
  • quantity — how many units to move
  • planned_date — the planned shipping date for the new shipment

Example:

[
  { "shopify_line_item_id": "1234567890", "quantity": 2, "planned_date": "2026-07-30" }
]

Result

The action returns the new customer shipment. The remaining quantities stay on the original shipment, so both halves keep their own picking and shipping schedule.