Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Bangladeshi Football Club
Chittagong Abahani Reserves and Youth are the reserve team and youth system of the Chittagong based Bangladesh Premier League club Chittagong Abahani Ltd. The youth system consist of an under-18 men's team that currently competes in the BFF U18 Football League, the top-tier league of youth football system in Bangladesh organised by the Bangladesh Football Federation. The under-18 team previously used to play in BFF U-18 Football Tournament. The reserve team, named as Chittagong Abahani Junior, competes in the CJKS-CDFA Second Division Football League, the third-tier football league of Chittagong football.
Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.
The reserve team, officially known as Chittagong Abahani Limited Junior, competes in the regional league system of Chittagong. It currently competes in CJKS-CDFA Second Division Football League, the third tier regional league of Chittagong. The team, sometimes referred as Abahani Limited Junior or simply as Abahani Junior, playing in the regional league since 2003–2004. The squad of the reserve team built with the local players of Chittagong.