If you have specific products, product tags, or collections that are available for shipping only on particular days of the week, you can set it up using the Fulfillment days override without changing the Fulfillment days used for the rest of the products in your store.
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Example Scenario: Your store normally allows Standard Shipping from Monday to Saturday. However, some fresh cakes can only be shipped on Friday and Saturday.
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https://www.youtube.com/watch?v=HGoSXVS0zXQ&pp=0gcJCckJAYcqIYzv
How to set product overrides by fulfillment days for shipping
- Under the Product overrides section, click on Add overrides.

- From the options given, click Create under the Fulfillment days override.

- Name your override. (Example: Weekend shipping)

- Choose how you want to apply the override:
- Specific products – Apply the rule to selected products.
- Product tags – Apply the rule to products with a specific Shopify product tag.
- Collections – Apply the rule to products in a selected collection.
If you select Specific products,
- Click on Add products.

- Choose the specific product(s) from the product list shown and press Add.

If you select Product tags,