Cut 4 (24x12-inch) sheets of Reynolds Wrap® Heavy Duty Foil. Divide chicken, bell peppers, pineapple chunks and pineapple preserves mixture among foil sheets. Sprinkle with salt. Bring up 2 sides of foil so edges meet. Seal edges, making tight 1/2-inch fold; fold again, allowing space for heat circulation and expansion. Fold other sides to seal.