To set a minimum quantity for your inventory in Amazon Seller Central, follow these steps:

Log in to Amazon Seller Central: Go to Seller Central, and log in to your seller account.

Access Inventory: In the Seller Central dashboard, hover over "Inventory" in the top navigation menu, and click on "Manage Inventory."

Select the Product: Find the product for which you want to set a minimum quantity and click on the product's title to open its details.

Edit Offer: In the product details page, locate the "Actions" dropdown menu, and select "Edit Details."

Set Minimum Quantity: Scroll down to the "Offer" section, and look for the "Minimum Order Quantity" field. Here, you can specify the minimum quantity required for an order. Enter the desired minimum quantity.

Save Changes: After entering the minimum quantity, scroll down to the bottom of the page and click the "Save and finish" button to save your changes.

Please note that setting a minimum order quantity may not be available for all product categories or listing types. Additionally, be cautious when setting minimum order quantities, as this can affect your sales and customer satisfaction. Make sure it aligns with your business strategy and customer needs.

Keep in mind that Amazon's interface and options may change over time, so if you encounter any difficulties or cannot find specific settings, it's a good idea to refer to Amazon's official seller documentation or contact Seller Support for assistance.