With regards to whether to specify 'P' or 'Y' for the Image Copy analysis option, these values are described as follows:
Y (run the COPY utilty and generate image copy control cards for all partitions of all tablespaces or indexspaces involved in an alteration).
P (run the COPY utility with partition independence. This option generates image copy control cards only for altered partitions of tablespaces or indexespaces involved in an alteration).
If P is specified, all partitions are copied for partition by growth universal tablespaces.
N (do not run the COPY utility). N is the default.
The following chart is available in the online help for the RC/M Migrate Strategy Analysis Options panel (PF1)
Further details on the Utility analysis options can be found at AnalysisOptions-UtilityOptions.