Question : Total cost formula using Excel

I am writing a report using Excel 2003 where I am attempting to create a total cost formula that will sum the values of 5 fields from the FA database.  The data is to be imported from tables, with the first table being a "master" table  and the other 2 tables are "transaction" tables.  A record must be in master table, but a corresponding record may or may not be in the other two tables.  To get data into the spreadsheet, I start with the master table and use VLOOKUP to match data from the other 2 tables.

You can assume EQUIP-NO fields are 5 character integers and the cost tables all have 2 decimal places

I've written this "script" based on CA/Easytrieve Plus ver. 6.3, but don't let that fool you.

FILEA
      EQUIP-NO-A      KEY

FILEB
      EQUIP-NO-B      KEY
      VALUE_FUEL_B
      VALUE_FLUID_B
      VALUE_MISC_B

FILEC
      EQUIP-NO-C      KEY
      LABOR-COST-C
      PARTS-COST-C


 D1=EQUIP-NO-A
I.  IF MATCHED (FILEA KEY (EQUIP-NO-A)
                                FILEB KEY (EQUIP-NO-B)
                                FILEC KEY(EQUIP-NO-C))            
      AB1 = VALUE_FUEL_B
      AG1 = VALUE_FLUID_B
      AL1 = VALUE_MISC_B  
      AQ1 = LABOR-COST-C
      AV1 = PARTS-COSTS-C
  ELSE
II.      IF FILEA AND FILEB (no match for FILEC)
            AB1 = VALUE_FUEL_B
            AG1 = VALUE_FLUID_B
            AL1 = VALUE_MISC_B  
            AQ1 = #N/A
            AV1 = #N/A
      ELSE
III.            IF FILEA AND FILEC (no match for FILEB)
                  AB1 = #N/A
                  AG1 = #N/A
                  AL1 = #N/A
                  AQ1 = LABOR-COST-C
                  AV1 = PARTS-COSTS-C
            ELSE
IV.                  IF FILEA no match for FILEB or FILEC)
                        AB1 = #N/A
                        AG1 = #N/A
                        AL1 = #N/A
                        AQ1 =  #N/A
                        AV1 =  #N/A
                  END-IF
            END-IF      
      END-IF      
  END-IF
BA1 = AB1 + AG1+AL1+AQ1+AV1

Let me present a few scenarios

I.
VALUE_FUEL_B = 100.00
VALUE_FLUID_B = 200.00
VALUE_MISC_B  = 300.00
LABOR-COST-C = 400.00
PARTS-COSTS-C = 500,00

BA1 = 100.00 + 200.00 + 300.00 + 400.00 + 500.00
BA1 = 1,500.00

IV.
VALUE_FUEL_B = #N/A
VALUE_FLUID_B = #N/A
VALUE_MISC_B  = #N/A
LABOR-COST-C = #N/A
PARTS-COSTS-C = #N/A

BA1 = #N/A + #N/A + #N/A + #N/A + #N/A
BA1 = #N/A. which is cool.

but ...

II.
VALUE_FUEL_B = 100.00
VALUE_FLUID_B = 200.00
VALUE_MISC_B  = 300.00
LABOR-COST-C = #N/A
PARTS-COSTS-C = #N/A

BA1 = 100.00 + 200.00 + 300.00 + #N/A + #N/A
Excel's answer is BA1 = #N/A, but in real life BA1 = 600.00

III.
VALUE_FUEL_B = #N/A
VALUE_FLUID_B = #N/A
VALUE_MISC_B  = #N/A
LABOR-COST-C = 400.00
PARTS-COSTS-C = 500.00

BA1 = #N/A + #N/A + #N/A +400.00 + 500.00
Excel's answer is BA1 = #N/A, but in real life BA1 = 900.00

Does anyone have an equation to handle all four scenarios?

Thanks,

Jeff

Answer : Total cost formula using Excel

try something like

=IF(ISNA(AB1),0,AB1)+IF(ISNA(AG1),0,AG1)+IF(ISNA(AL1),0,AL1)+IF(ISNA(AQ1),0,AQ1)+IF(ISNA(AV1),0,AV1)

in BA1