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Default Please help with summative column (VLOOKUP???)

P2=IF(COUNTIF(H2:$H$2000,H2)=1,H2,""
Q2=IF(ISERROR(VLOKUP(L2,$H$2:$I$2000,2,FALSE)),"", VLOOKUP(L2,$H$2:$I$2000,2,FALSE))
R2=SUMPRODUCT(($H$2:$H$2000=L2)*($J$2:$J$2000))

Insert and copy down 2000 rows