Having trouble making a cut

i just want to get a specifique cut on this barclet but it dosent work i tried doing booleansplit but nothing i want to have a cut like the screenshot


here is the file if someone can help me

forgot the file?

FLOWER.3dm (4.7 MB)
sry the file was too
big i removed some stuff to fit the requirment

hello can i get some help please i am still stuck on the same problem

What are the cutting objects in you file?

like i said i want to make the lower petlle to be saprate close polysurface like the one to the left of the flower i tried to do a booleansplit but it always fails

What were the inputs to the BooleanSplit command you tried? There must be the object to be split and cutting objects.

object to split was the flower the complete one and the cutting object was the petlle that just sit left to it i recrated that lower petlle by doing a sweep shape