PCM600 Hardware Channel Allocation
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PCM600 is certainly meant for anybody who wants to use and learn about ABB protection relays :)
Since the device you are configuring is from 670 series, you need to start the engineering flow using Hardware Tool to define what kind of hardware modules exists. After HW Tool, Application Configuration tool contains information about available hardware modules and respective channels.
Engineering flow is explained in respective relay engineering manuals. Please check chapter Engineering Process and Workflow in 670 series Engineering Manual.
Learning with pre-configured PCMI/PCMT files is a really good starting point, just like suggested. ABB provides pre-configurations for 670 series devices and these are available via Update Manager in PCM600.