Assuming the data posted is within A1:F22, with the salesman col (col A)
fully populated from above** (this is required, see below for link to get
this done on a copy of the pivot. Alternatively, you could frame it up to
directly read the source table for the pivot)
you could place this in say, H1
=SUMPRODUCT((ISNUMBER(MATCH($A$2:$A$22,{"SG","NK"},0)))*($F$2:$F$22="NLF")*$C$2:$E$22)
which returns the total sales of Product NLF, made by Salesman SG and NK for
the months of Jan, Feb and Mar (total for the 3 months)
If you need separate totals by the month for Jan, Feb and Mar
place this in say, H2
=SUMPRODUCT((ISNUMBER(MATCH($A$2:$A$22,{"SG","NK"},0)))*($F$2:$F$22="NLF"),C$2:C$22)
then copy H2 across to J2, to return desired results
**so that it looks like this
Salesman
SG
SG
SG Total
JD
JD
....
JD Total
NK
....
NK
NK Total
Try Debra Dalgleish's page for ways to fill in the col blanks:
http://www.contextures.com/xlDataEntry02.html
Excel -- Data Entry -- Fill Blank Cells
Fill Blank Cells
Fill Blank Cells Programmatically
(Sub FillColBlanks() by Dave Peterson)