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Add Configurable products in Magento 2 via Admin Panel

In the configuration section ofI want to add Simple products in the configurable product,. I can't find the option for adding products manuallyin the configuration section of the configurable product. It only showing create configuration option. I want to add my simple products in the configurable product. 

Add Configurable products in Magento 2 via Admin Panel

In the configuration section of the configurable product, I can't find the option for adding products manually. It only showing create configuration option. I want to add my simple products in the configurable product.

Add Configurable products via Admin Panel

I want to add Simple products in the configurable product. I can't find the option for adding products in the configuration section of the configurable product. It only showing create configuration option. 

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source | link

Add Configurable products in Magento 2 via Admin Panel

In the configuration section of the configurable product, I can't find the option for adding products manually. It only showing create configuration option. I want to add my simple products in the configurable product.