Thanks Brad for the quick response.
After a year of purchasing the PX560, now I am getting to the point of building my set and hence exploring the instrument in depth.
So why did Casio not think of having such an option ?
I am trying to understand why Casio would do this ... is it because it would be easier to do the following:
1) Find the closest one and tweak that (but in this specific case there does not seem to be a rhythm like "Child in Time")
2) record a rhythm using drum tones and store it, then add it as a rhythm
3) create a new rhythm in a daw and add it as a rhythm (what formats are supported)