Covariant formalism of reductions of superconformal gauge theories to Poincaré supergravities

Covariant formalism of reduction from general gauge of extended supergroups to the off-shell Poincaré supergravities is considered. The formalism is based on a field system including both gauge and Goldstone superfields which parametrize the quotient space of broken symmetries and are connected with pure gauge degrees of freedom. Thus as a result of the choice of a gauge supergroup, stability subgroup, (super)group of base diffeomorphisms and structure of Goldstone superfields which form compensators of spontaneously broken symmetries, one completely determines the supermultiplel of physical and auxiliary fields which should be used to get the dynamical description of the system.