code: def addVars(self, df):
      lAllLevelsDataset = self.create_all_levels_dataset(df)
      return lAllLevelsDataset
  
imports: import pandas
  import numpy
  from ..None import ForecastEngine
  from .None import Options
  from .None import Perf
  from .None import Utils
  from .None import Plots
  import time
label_desc: Use image node_id 8 for calling the cSignalHierarchy obj's underlying member method code with example usage: obj.addVars(df) and returns: lAllLevelsDataset