Although it seems that two categories of robotic systems, the dynamic object manipulation and dynamic biped walking systems, are completely different to be dealt with at the first glance, we believe that there exists strong relationship between these two types of robotic systems. This paper studies the correlation of the dynamic biped walking and dynamic object manipulation in all areas (passive, underactuated and fully-actuated classes). In this regard, the virtual problem of "the amputee walking robot" is defined to describe the relationship between these two kinds of robotic systems. From this viewpoint, the problem of dynamic biped walking is a special case of dynamic manipulation of multibody objects in which the multibody object does have a structure similar to the structure of biped robots. In other words, we can say that the ground manipulates the biped robot which is considered as a multibody object. Then, the concept of correlation is investigated in three different classes of the problem: passive, underactuated, and fully-actuated systems. For each of three categories, appropriate examples are studied. It will be shown that the details of the walking problem could be extracted from the mother problem of dynamic manipulation of multibody objects in all its aspects.