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To stop an ongoing CSS animation and start a new one, you can use JavaScript to add or remove classes that trigger the animations. Here's an example process:

1. Use JavaScript to select the element that has the ongoing CSS animation.

2. Remove the class that triggers the ongoing animation. This will immediately stop the animation.

3. Add the class that triggers the new animation.

4. If needed, use JavaScript to reset any CSS properties that were modified by the previous animation so that the new animation starts from the correct starting point.

For example, if you had an element with a class of "slide-in" that triggered an animation of sliding in from the left, you could stop it by removing the class:

const element = document.querySelector('.slide-in');
element.classList.remove('slide-in');

You could then add a class of "scale-up" that triggers an animation of scaling up the element:

element.classList.add('scale-up');

If the "slide-in" animation modified the element's "left" property, you may want to reset it before starting the "scale-up" animation:

element.style.left = '';

This process can be customized to fit the specific animations and elements you're working with.