if you are refering to pdf reports (Monitor>Reports...) they will adjust their mesure units automatically. For example if some application produces 15,000,000,000 bytes of traffic it will be show as 15 GB of traffic in the reports. If it produces 1,500,000 bytes of traffic it will be show as 1,5MB etc.
When I read your question again I realised that this probably isn't what you were asking, sorry:)
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