Possible match and index formula needed please

[ryanwood]

Hello all I was wondering if any one could please give me advice on m
current problem with excel. I need to compare and copy values betwee
two different sheets.
I receive an invoice every month which contains a lot of the same dat
is there a way I can compare the values in columns f,g and j and if the
all match insert the value from L from my old invoice to my new one. An
help would be greatly appreciated.

Thanks

Rya