Yes. Proxy Manager supports external proxies from other vendors. Connecting external proxies will allow you to optimize and manage all of your proxies in one place.
- Login to your Proxy Manager
- Create new port
- Select 'External' proxy
- Add your proxies in {'YOUR_USER:PASSWORD@IP:PORT'} format
- Click 'Save' and you will have the external proxies available as one of the Proxy Manager's ports
See example below: