Creo 6 already added sketch regions to be able to quckly select overlapping sketch zones in more complcated sketches, which
is a capability that does in fact alredy exist in other CAD softwares.
But as far as I'm aware, at least in the videos I saw in Solidworks tutorials, is that the sketch regions are a parametric selection in an extrude or revolve feature, while in Creo, the implementation is different, meaning, that the sketch region select that the user selects in the user interface, is converted to a regular sketch with projection and auitomatic trimming of the overlapped entities. If the original sketch is redefined, and new entities added or deleted, the extrude or revolve will fail, and the user has to manually re--project the sketch entities and re-trim everyting to resolve rhe error. Where in Solidworks, the user would only have to make a single click to re-identify a sketch region. I don't know how NX deals with it, but I like the idea of improving Sketch Regions funcionality to make it a permanent parametric selection in an extrude or revolve feature, as in Solidworks, If it does not keep the associativity in the final feature, and allows easy redefining of sketch regions, then this methology will not be much used, which is unfortunate, since sketch regions initially speed-up tremendously modelling times.
It's not only a way of select, and maintain it parametrically, as a sketch region. It's also a way to select faces, curves, parts, geometries within sketch environment...
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