In Vedic creations and recreations, ie. the continuous cyclic cycles of the material universes , we can consider the roles of Mahavisnu the original impregnator of the consciousness particles into matter , the role of Lord Bramha who creates the machines of the bodies , and the role of the supersoul who accompanies the souls in their journeying throughout the material energies. The compact responsive universe and put into place and are functioning with the help of four personalities, three Visnu forms, and Lord Bramha, who is their servant.

Lord Visnu, in all his forms, does not directly touch the material energies when the living beings are impregnated , it is carried out by Sadasiva , a manifestation of Sankarsana , who is an  expansion of Visnu.  The” nuts and bolts ” workings of creation are allocated to Lord Bramha.
More details are coming .
http://www.thevedicspectator.com