Hello,
A BC (Business Configuration) is a management tool that allows user to record, save and share customization settings. It can contain data from one or more IMG activities. When you activate this BC set in other system the values stored in BC sets are copied to corresponding customizing tables of the system.
In MDG, once BC sets are activated system copies all the standard configuration tasks in to MDG IMG activities (ex. CR types, Business Activities etc)
Please go through the link shared in above thread which gives out the which BC sets to be activated & contains details list of activities need to follow to configure system.
BR
MSR