Standard cell global supply changes

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amiramu10

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Hi, I have synthesized a decoder. I imported this to virtuoso. While importing I gave the supply as vdd and gnd while the default for the cells are global signal vdd! and gnd!. But when I am seeing in the layout they are still vdd! and gnd!. How come I can change these in layout as I want pins for them. I think if I keep them in global form then pin corresponding to power supply will not be generated. Please help.
 

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