How to get VDD & VSS Symbol in Schematic when Import CDL

[baixf]

When I import a CDL netlist using Cadence Import CDL function, I can
get a schematic but can not get a correct VDD or VSS symbol in the
schematic. VDD and VSS are dealed as a net. If I treated VDD &
VSS as pins, a VDD or VSS input pin will appear in schematics. How
can I get a correct VDD or VSS symbol?

Thanks!