Rotating a shape 90° shouldn't be too complicated but...

Hi ThierryEMMANUEL I've made an updated Storyline file for you. This puts the code into a function and localises the rotationDegree variable to the object. You don't need to reference the object, as we can get this information from the "event" property, which is passed through the function "rotateShape".

This code runs on timeline start.

window.rotateShape = function(e)
{
	// storyline variable
	const player = GetPlayer();
	const rotation = player.GetVar('rotation');
	const duration = player.GetVar('duration');
	// get the target
	const target = e.target.closest('[data-model-id]');
	console.log("target",target);
	// get rotationDegree if defined (default zero)
	let rotationDegree = Number(target.dataset.rotationDegree) || 0;
	console.log("BEFORE :: rotationDegree",rotationDegree);
    // Increment rotation by 45 degrees
    rotationDegree += rotation;
    console.log("AFTER :: rotationDegree",rotationDegree);
    // assign rotationDegree to object dataset property
    target.dataset.rotationDegree = rotationDegree;
    // Use GSAP to animate the rotation
    gsap.to(target, { duration: duration, rotation: rotationDegree });
}

You then just call this function from the click trigger of each shape.

window.rotateShape(event);