Hi Fred,
Thanks for your feedback! Currently, if you run a backtest with a specific stock list, the next time when you run the backtest, it will be auto populated with the same list so you don't need to manually enter the stocks again.
When you use the "New Backtest" function, it will clone the backtest with the exact same parameters which is the same as copying a backtest.
Hope this helps.
The PyInvesting Team