Hi, try these formulas 
Formula:
F3{=IF(ISNA(MATCH(B3&C3&D3,Orders!B$3:B$20&Orders!C$3:C$20&Orders!D$3:D$20,0)),"N","Y")}
Formula:
H3{=IFERROR(MATCH(B3&C3&D3,Orders!B$3:B$20&Orders!C$3:C$20&Orders!D$3:D$20,0),0)}
Formula:
J3=IF(SUMPRODUCT(--(Orders!B$3:B$20&Orders!C$3:C$20&Orders!D$3:D$20=B3&C3&D3))>0,"Y","N")
and copy the formulas down...
ps: first two of the above are array formulas, i.e. press ctrl+shift+enter instead of just enter
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Alvin
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