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In 2003, Barcelona B won the amateurSpanish 4th-tier levelLiga EBA, and thus got promoted to the LEB 2 division, but afterwards, they renounced their spot. After an agreement between FC Barcelona and CB Cornellà, for Cornellà to collaborate again as a reserve team of FC Barcelona; the 'B' team was folded by Barcelona, between 2005 and 2010. In 2010, FC Barcelona B was re-opened, and played in the LEB Plata division.
The team then played in the Spanish 2nd-tier level LEB Oro division, from 2012, when the team gained a vacant berth in the league, to 2014, when they were relegated down again to the LEB Plata division. In August 2015, the club gained a vacant berth back to the second division LEB Oro.
The team would move between the second and third tiers of Spanish basketball until the 2020-21 season. Despite achieving the 2nd place in the 2020-21 LEB Plata season and thus promotion to LEB Oro, Barcelona reached a deal with Força Lleida CE and CB Cornellà, switching licenses with these two clubs to be demoted to the 4th tier of Spanish basketball, Liga EBA. The club cited sporting and financial reasons to demote the team and has since focused on developing young players, consistently ranking in the top places of the Tercera FEB category. Since then, the team has renounced promotion to the former LEB Plata. Several young Barcelona B players have been called up to play for the first team since, such as Dame Sarr [es] and Kasparas Jakucionis.