Is it possible to see the sen2cor avalaible in the graph builder?

you can automate sen2cor it simply using the command line.

L2A_Process --resolution {10,20,60} (chapter 3.3.1)

Thanks for your answer. I already know that. I was wondering if there is a way to see in the grpah builder so then i can use it in batch processing?

If you simple need to apply sen2cor on a large number of images you can create a bat file containing the command multiple times addressing the single folders.

L2A_Process --resolution 10
L2A_Process --resolution 10
L2A_Process --resolution 10
L2A_Process --resolution 10

Or you call it with a loop

for folder in allfolders:
    L2A_Process --resolution 10 folder