build someone into something
and build someone into make a person an integral part of an organization or a plan. The mayor built his cronies into the organizational structure of the town. He built in his relatives as part of the administration.
build something into something
and build something in 1. to integrate a piece of furniture or an appliance into a building's construction. We will build this cupboard into the wall about here. We are going to build in a chest of drawers. Then we will build another one in.
2. to make a particular quality a basic part of something. We build quality into our cars before we put our name on them. We build in quality.
3. to make a special restriction or specification a part of the plan of something. I built the restriction into our agreement. The lawyer built in the requirement that payments be by certified check.