basically...
u need 200 Total time, of which a minum of 100 has to be PIC
the 100 PIC can include time which is PIC(U/S)
for instance... you may have 95 hours of PIC and the remaining 5 hours may be made up of the times of your CPL or ME or IR tests, for example.
However when you are doing a skill-test, the time is only classified as PIC(U/S) when you pass the test.
If you fail, or only partial pass, then it counts as P2.
hope this helps...