As a generic comment: any data imported using a data step can do practically anything you want in a data step. I routinely in a read data step add analysis and data quality indicator variables, write messages to the log or another file about suspect values or data inconsistencies, recode character values to numeric and/or apply standardization rules such as proper case or sentence case to character variables.
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Learn how use the CAT functions in SAS to join values from multiple variables into a single value.
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