Hi Rikki,
thanks for your help; I have downloaded the PA2-X-pro manual from Korgpa.com : there is both a full manual (26 Mb) and a manual for advanced editing only (4.3 Mb). You will find all the info you need about importing samples, time slicing, etc in the latter in the "Sampling operating mode", at pag. 28.
The same manuals are available also for the PA-800, only the sizes are different.
Importing sampled loops and creating your own styles the way Ketron does is for me one of the most attracting features of these arrangers.

Link for the PA-2-X-pro manuals

Link for the PA-800 manuals
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.