If you possess the Purpletree Opencart Multi Vendor Extension and desire to enable vendors to handle shipping methods through their seller panel, you can achieve this by installing the extension.

Vendors have the capability to manage shipping methods directly within their seller panel.

This extension accommodates a total of 8 distinct shipping methods for the Purpletree multi-vendor platform:
Supported OpenCart version 3.x

User Guide.

Flat Rate Shipping
Free Shipping
Weight Based Shipping
UPS Shipping
USPS Shipping
FedEx Shipping
Pickup Shipping
EC-Ship Shipping
Hitdhlexpress Shipping

The setup and configuration of these shipping methods can be performed in the admin panel and subsequently be accessed by vendors in their respective panels, located under the "Shipping" section. It's important to note that the availability and configuration of these methods may vary depending on the specific OpenCart version and any additional extensions or modifications that have been implemented on the platform.