> For the complete documentation index, see [llms.txt](https://docs.commercelayer.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.commercelayer.io/core-api-reference/2026-05/order_subscription_items.md).
# Order subscription items
The order subscription item object and the allowed CRUD operations on the related resource endpoint
Order subscription items can be of type `skus`, `bundles`, or `adjustments` and are used to generate the target order's line items involved when [order subscriptions](/core-api-reference/2026-05/order_subscriptions.md) are automatically generated using [recurring order copies](/core-api-reference/2026-05/recurring_order_copies.md). Order subscription items are automatically generated from the source order's line items with frequency, according to the strategy set at the [subscription model](/core-api-reference/2026-05/subscription_models.md#subscription-strategies) level:
* `by_frequency` — for each automatically generated order subscription, one order subscription item is generated per source order line item that has that specific frequency.
* `by_line_items` — for each automatically generated order subscription, only one order subscription item will be generated.
Like line items, order subscription items have a quantity and a unit price — both inherited from the source order's line items — that can be changed anytime by updating the order subscription item itself to customize the generated target order's line items. If the source order's line items' unit price is computed according to a [price frequency tier](/core-api-reference/2026-05/price_frequency_tiers.md), any change to the tier itself that happens after the order subscription item generation won't be reflected on the order subscription item's unit price.
How-to
Check the related [guide](/how-tos/placing-orders/subscriptions.md) to learn more about how to generate automatic subscriptions from a source order and how to add, remove, or update order subscription items belonging to an already generated order subscription.
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