There are several synonyms for the phrase "worked in to," including incorporated, included, integrated, blended, assimilated, and merged. All of these words refer to the same idea of making something a part of a larger whole or integrating it into a larger entity. For example, when writing an essay or report, you might work in a citation from another source by incorporating it into your own writing. In the business world, you might work to integrate one company into another by merging them together. Whether you're using "worked in to" or one of its synonyms, the goal is the same: to seamlessly bring together disparate pieces into a cohesive whole.