Can I assign pre order status to a category in bulk?

It’s possible to complete this action from Magento product grid provided you have an option to sort products by category (this feature is missing in Magento out-of-the-box but can be added through customizations or extensions like Extended Product Grid).

In order to set products from a particular category to Pre order, you need to apply a mass action called “Update Attributes”.  On the inventory tab you will need to choose “Allow Pre-Orders” in the backorders field:

Magento Pre Order by Amasty

See more details on Pre Order page

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