You could use:
=INDEX(Assessment!$AB$1:$AB$6,MATCH($A3&H$2,Assess ment!$A$1:$A46&TEXT(Assessment!$F$1:$F6,"MMMM"),0) )
as an array formula. This will output either the amount in AB if a match is found or '#N/A' if not. To display only matches would require:
=IF(ISERROR(INDEX(Assessment!$AB$1:$AB$6,MATCH($A3 &H$2,Assessment!$A$1:$A46&TEXT(Assessment!$F$1:$F6 ,"MMMM"),0))),"",INDEX(Assessment!$AB$1:$AB$6,MATC H($A3&H$2,Assessment!$A$1:$A46&TEXT(Assessment!$F$ 1:$F6,"MMMM"),0)))
again, as an array formula.

Array formulae are input with Ctrl-Shift-Enter.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]