Howdy Roman,
I would love to help you with this.
Basically that would be classed as a one-time import now. When you go to the Import screen select New Import, One-Time Import, input the URL and hit preview. You can now select which of the events you would like to import.
The old screen definitely made it a bit easier to repeatedly one-time import from the same source, and we are interested in enhancing the new one to support that as well. Until then though the One-Time Imports should be able to accomplish the same goal, just via a little different pattern.
Does that answer your question?
Cheers!
– Brook