ManageData(cols, vars, parent = NULL)cols and vars components of 
Data. The cols object is a list whose length is equal to 
the current number of data variables. Each component in cols is linked 
to a specific variable, and contains the following components:name and unit.data.raw data frame (see ImportData).SummarizeData).vars object is a list with components:cols.EditFunction); and 
(3) remove and (or) reorder variables in the data table.EditFunction