The Barclays Premier Reserves League (north) leaders were three goals up by half-time courtesy of goals from Giuseppe Rossi, the Italian striker netting on 14 and 29 minutes, and Darron Gibson.
Rene Meulensteen's side extended their lead twenty minutes into the second period when Rossi scored his third and United's fourth.
Blues: Legzdins, Mark Hall, Sadler, Oji, Campion, Alsop, Birley, Hojsted, Allen, Wright, Motteram. Subs: Hinks, Wilson, Davis, Johnson, Green.
Man United: Steele, Bardsley, K Lee, M Howard, Piqué, Gibson, Neumayr, R Jones, Campbell, Rossi, Solskjaer. Subs: Marsh, Zieler, Cathcart, Rose, Moran.