The variety of views here is quite frightening! My experience in OZ on flight-deck famil at least encourages me that a cross section of OZ pilots understand the procedures.
Consider a STAR (which is also an ATC clearance which is charted to cut down on RT) with "reach FL180 by PRANG". For a start I would not re-state the requirement with a level assignment, the pilot has it already.
Even without a STAR I am most unlikely to assign "descend to FL180 reach FL180 by PRANG" unless I want the aircraft to maintain, or there is something else in the way. If I then assign FL140 (without a requirement) the previous requirement STANDS.
If I want to impose an additional requirement I must prefix it "additional requirement" or 180xPRANG is cancelled. So, with the above STAR:
"Descend to FL180," means "descend to FL180, reach FL180 by PRANG."
"Descend to FL140," means "descend to FL140, reach FL180 by PRANG."
"Descend to FL140, reach FL140 by AUGER," means "descend to FL140, cancel PRANG requirement, reach FL140 by AUGER."
"Descend to FL140, additional requirement, reach FL140 by AUGER," means "descend to FL140, reach FL180 by PRANG, and reach FL140 by AUGER."
Finally, (if anybody is still reading) I understand CC is an old morse thing, certainly beloved of Asian Aeradio operators.
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"Station calling Centre, grow a head..."