The phrase "in direction through to" can be replaced with a variety of synonyms depending on the context in which it is used. Some of the most commonly used synonyms are: from one end to another, all the way across, throughout, from start to finish, end to end, and across the length of. Other possible synonyms include: across the expanse of, across the span of, throughout the entirety of, from beginning to end, and throughout the duration of. Choosing the most appropriate synonym will depend on the specific wording of the sentence and the desired tone and level of formality.