How can I show gstr1 old car sale value

proprietor sale his old car in his fixed asset. I have raised invoice WDV - Sale Value. = Taxable value and 18 % GST. My query when i show GSTR 1 B2B table. Invoice Value = Taxable Value + GST. or Car Sale Value.? EX- WDV Value = 150000 & Sale Value = 250000. Now Taxable Value = 250000-150000 = 100000. & 18000 GST Then GSTR 1 B2B Table Ivoice Value = 118000 and 150000 can i Show Nil rated table. Kindly advise sir