What you can see in the screenshot is an example:
1) i decide to import a PGN file about Modern Scandinavian. This file is made of a main line and some variations.
2) when i've finished to import it, only the main line (Cc3) is flagged (that means that in training mode ONLY that line is active). Cf3, another possible line, must be manually flagged to have it in the training mode. And i want Cf3 to be active because it's another possible white move.
When you have to deal with huge files it's a hard work to go through all the lines and activate them all.
Also because in my case the pgn file is perfect and the lines are already selected before importing it.
That's the reason why i want to know if i miss a particular option or setting that allows to have all the lines in the PGN active when you import it.
Thank you again
Note: i forgot to mention that i'm from Italy, so the notations in the screenshot are in Italian: Cc3=Nc3 Cf3=Nf3