Using GDGs and symbolic variables in data set names
You can use GDGs (generation data set groups) and symbolic variables to simplify the task of data set name construction when you use the DSNAME, COPYDSN, RECOVERYDSN, or MODELDCB option in an output descriptor or in a COPY (or COPY IMAGECOPY) statement.
You can use a GDG and symbolic variables together in a data set name.
Important
GDGs cannot be used with Instant Snapshot copies. However, you can use symbolic variables to construct output data set names for Instant Snapshots.