“…The reduced dynamics on the reduced tangent bundle G\TQ is studied under the realm of the Lagrange-Poincaré equations. If, in particular, Q = G then the Lagrange-Poincaré equations reduces to the Euler-Poincaré equations on the Lie algebra g. Accordingly, this paper may be considered as a generalization of [18,19,17], wherein the trivialization and reduction of the Tulczyjew's triple were studied in the case Q = G. Referring the reader to [10] for further details on the reduced dynamics, especially the vertical and horizontal variations by means of an Ehresmann connection, we remak that the horizontal-vertical decomposition of the Tulczyjew's triple we shall present in this note provides a proper setting for the Legendre transformations of the horizontal-vertical Lagrange-Poincaré equations studied in [9,10,47]. In other words, these works carry a motivational importance for the present paper.…”