The base container line tells MSFS which model of aircraft your livery is for. The example you gave means the livery is for the Wheeled version of the 172 with classic gauges.
If you were doing the livery for the G1000 version of the 172 the line should read
base_container = “…\Asobo_C172sp_AS1000”
Or for the float version it would read
base_container = "…\Asobo_C172sp_AS1000_Floaters
Or for the ski version it would read
base_container = “…\Asobo_C172sp_AS1000_Skis”