The MERGE command makes it possible for you to process data from
    several files by combining information from several performance
    data files into one PCA performance data file. You can use the
    MERGE command to combine several PCA performance data files or to
    combine data extracted from several SPM data files into one PCA
    data file. This allows you to process and display the PC sampling
    data collected by SPM (Software Performance Measurement). Merged
    data is always appended to the currently opened performance data
    file.