On the eFiling wizard page (the first page), just enter the number of IRP5's that you have in the number entry box. Then when you click the button to generate your tax return form there will be multiple empty IRP5 documents for you to fill in. Don't worry about adding up any amounts or trying to combine multiple into one - you need to include each IRP5 separately on your single ITR12 tax return for the year so just do one at a time.
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