Hi partner,
Could you explain in more detail? Or give an example.
Generally, we will connect entities through N:N relationships or connections.
If I understand correctly, the premise that you want to achieve that the premise of closing Quote to win is that its Account is winning, right?
If so, we can create a real-time workflow of Quote to check if its Account is winning, if it's false, give a error message to remind the user to select an account that has already been won.

So please give us more information, and I will help you with steps.