ARRAY formula replaced .
Normal formula in C3 then copied.
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=IFERROR(SUMPRODUCT(MMULT(SUMIF(OFFSET('Parts Table'!$D$3,MATCH($B3,'Parts Table'!$B$3:$B$30,0)-1,COLUMN($D$3:$M$3)-COLUMN($D$3)),">0"),SUMIF(OFFSET('Units Sold by Model & Market'!$C$3:$C$22,21*(ROW($1:$10)-1),COLUMNS($C3:C3)-1),">0"))),"")
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