If each item in Interest!C6:C256 exists in Analysis!A5:A75, try...

=SUMPRODUCT(--(Interest!$A$6:$A$256=E$4),--(Interest!$A$6:$A$256<=E$5),-
-(LOOKUP(Interest!$C$6:$C$256,Analysis!$A$5:$G$75)=
$A$8),Interest!$F$6:$F$256)

If Interest!C6:C256 may contain items that do not exist in
Analysis!A5:A75, try...

=SUMPRODUCT(--(Interest!$A$6:$A$256=E$4),--(Interest!$A$6:$A$256<=E$5),-
-(ISNUMBER(MATCH(Interest!$C$6:$C$256,Analysis!$A$5 :$A$75,0))),--(ISNUMBE
R(1/(LOOKUP(Interest!$C$6:$C$256,Analysis!$A$5:$G$75)=
$A$8))),Interest!$F$6:$F$256)

Hope this helps!

In article ,
"KM01" wrote:

I am trying to convert a list of payments in this format:
Date | Account Code | Amount
into a quarterly cash flow categorised by Account Code type. Im trying to
use VLOOKUP to convert the Account code into a category so that I can split
the cash flow into 3 categories. I have a lookup table which relates each
Account Code to one of three categories.

Im using:
=SUMPRODUCT((Interest!$A$6:$A$256=E$4)*(Interest! $A$6:$A$256<=E$5)*(VLOOKUP(V
ALUE(Interest!$C$6:$C$256),Analysis!$A$5:$G$75,7)= $A$8),(Interest!$F$6:$F$256)
)

The list of payments is on a sheet called interest. A6:A256 contains the
dates, E4 & E5 contain the start & end dates for each quarter, C6:C256
contains the account codes (irritatingly held as text), Analysis!A5:G75
contains the lookup table, A8 contains the category I want to look up, and
F6:F256 contains the amounts.

This formula successfully sums between the dates but doesnt distinguish the
categories. What am I doing wrong?!