Hi @ari100200,
FedEx for WooCommerce is a stand-alone plugin and it does not require the additional Flexible Shipping installation. They work as independent plugins and they do not integrate with each other.
You can find more information on this in our documentation: https://docs.flexibleshipping.com/article/133-fedex-faq.
When it comes to the feature you mentioned – it is available only in the plugin’s PRO version and unfortunately we are not supposed to discuss about the PRO plugins here. This forum is dedicated to the free FedEx plugin.
If you need some more information about the FedEx Live Rates PRO / Flexible Shipping PRO plugins please contact us directly at https://flexibleshipping.com/support/ and we will answer all your questions there.
Best regards,
Tomek