=ARRAYFORMULA(VLOOKUP(C123&" "&D123,{'Feature HELENCPQ'!$G$2:$G$620&" "&'Feature HELENCPQ'!$H$2:$H$620,'Feature HELENCPQ'!$I$2:$I$620},2,false))

Well that's a vlookup of an array with 2 cells merged in a 'Ghost' cell made to be compared with another cell which btw is in another sheet.