This is my file
lvtnfet      cmos20lpm      lvtnfet_b      symbol d g s b PROPMAP m=m 

And this would be my output file
lvtnfet_float      cmos20lpm      lvtnfet_b      symbol d g s b PROPMAP m=m
lvtnfet_auxpc2      cmos20lpm      lvtnfet_b      symbol d g s b PROPMAP m=m