Importing your existing Universal Analytics goals and setting up new GA4 conversions has been made easier with Google's goal import feature.
Providing your existing goals are either Destination or Event goals, you can now import goals from your UA property into GA4. You'll find these in your Conversions report.
The limit to how many conversions you can have is 30.
(GA3) Goals = (GA4) Conversions
Although this feature might be handy for some, we would recommend configuring the goal from scratch to avoid any inaccuracies that may follow over from an existing Google Analytics property. Remember, this is a perfect opportunity to start fresh and implement a clean setup. These opportunities don't come around too often to ensure you do it right!