No we do not. Because it can create liability for the Seller. Potentially, you have an agent who does not know the Seller, may or may not know the property, representing the Seller. If the Subagent misrepresents the property to a buyer, they could embroil the Seller in a lawsuit.
Subagency is left over from the dinosaur era. When ALL agents represent the Seller. We offer compensation to transaction brokers and buyer agents. So the agent bringing the buyer will get paid whether they represent the buyer or not. There is no need to allow the agent bringing the buyer to represent the Seller. If you explain subagency to a Seller clearly, and I have, they will demand that you not permit this.
The real question should be: Why on earth would you permit and compensate subagency?