Get Past Bouncer
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All The Fractured But Whole Guides
To get to the attic shortcut in The Bowels of the Beast in South Park: The Fractured But Whole open investigation mode and throw a Snap N Pops at the ladder:

To get to the attic shortcut throw a Snap N Pops at the ladder.
Once your are in the attic throw a Snap N Pops at the monitor:

Throw a Snap N Pops at the monitor to get to the attic shortcut.
Then move the ladder near the table at the window:

Move the ladder near the table near the window to get to the attic shortcut.