A transformation, is a change. so transformational, in a change taking place.

As an example, the basic business of a grocery store is to see groceries. The purchases by each customer represent the the TRANSACTIONAL level of the store. When stores introduced self-checkout registers, that would be a change at the TRANSACTIONAL level. The larger process for the store would be the business of selling groceries. If the store changed from just selling food items to become a super-store selling like a Costco or Sam’s Club that would represent a TRANSFORMATIONAL change in the basic business for the store.

Does this help?

transformational is of changing to different shape