You can insert each flashback into the curly brackets as well. Orr you can use labeling and the goto command. You can use these commands like so:
Hello, I need some help again. 
Since I can’t show an Image of my script I just typed it myself: INT. BLACK - NIGHT
@AUNT KAYSA enters from right to screen right
@LEORA enters from left to screen left
NARRATOR (ARI NICHELLE)
Meet Leora and her Aunt Kaysa.
@LEORA is talk_greet_shy
LEORA
Hi…
@AUNT KAYSA is talk_greet_neutral
AUNT KAYSA
Hello.
NARRATOR (ARI NICHELLE)
Okay, want to start from a flashback from Leora's memory or Her Aunt Kaysa?
choice
“LEORA”{
@LEORA is talk_explain_neutral
LEORA
Alright, I was living in a…
@transition fade out red in 1.5
goto Leora_flashback
}
“AUNT KAYSA”{
@AUNT KAYSA is think_rubchin
AUNT KAYSA
Oh, well, when I found out that…
@transition fade out white 1.5
goto AuntKaysa_flashback
}
label Leora_flashback
since i inserted the goto command it will automatically goto this label. After you finish with this, you can use the goto command for aunt kaysa as well.
label AuntKaysa_Flashback
This would prompt the choice to skip to this label when the choice is chosen. But, the easier way would be to add the flashback in the brackets themselves