You want to keep hip, center, shoulders, and head aligned as if on a common axis, while free to rotate about that axis individually. As lady your alignment won't be perfectly straight, but it still needs to be consistent.
Rotationally, the area just below your shoulders will always be parallel to that area of your partner. Your hips may move together or in opposition. Your feet generally point in or against the direction of motion, or at a small angle to it for CBMP steps. And your head usually follows the angle of your feet - magnified a bit, but surprisingly close.