On your back office, use CTRL + K shortcut to open the quick launch bar and write "/shipping" to discover the Shipping methods screen.

The number of companies added can vary depending on whether you are using the Enterprise or the Community version, but you can also add your own.

The Odoo Entreprise comes with many more shipping methods already configured.

You can find more information about shipping methods in Odoo Docs

Hi,

Please refer the following blog:https://www.cybrosys.com/blog/how-to-integrate-a-shipping-method-with-odoo-16

Hope it helps