I just started working on STM32WB55 and was going through the BLE example codes given in the STM32Cube_FW_WB_V1.2.0 package. I am confused in understanding the program structure of the code (where to add new services, characteristics, where to handle...

I have downloaded the stm32cube package that contains the BLE example but i am unable to correctly import and run any of the project on the MCU.Looking for help, thank you.