Tricky vlookup with if formula

Hi experts excel 2010

Hi experts excel 2010

How would you write a formula so if in column A cell 2 you have a data value and cell A3 is empty, so the formula copies the data entry from cell A2 and in cell A3 the lookup applies. Formula in cell b2. Etc...

So
Col A.          Col B.
Wcd.            Wcd.
                     Here blank look finds value from look up table
Adds.           Adds.

Etc...
route217JuniorAsked:
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Glenn RayExcel VBA DeveloperCommented:
Assuming the formulas will be in column B, I think it would look something like this (in cell B2, copied down):
=IF(A2<>"",A2,IFERROR(VLOOKUP(A1, table_array, col_index_num, [range_lookup]),"")

This isn't really applicable on row 2, but when copied down the formula will check if there is a blank value in the adjacent cell.  If the cell isn't blank, then the formula returns the same value as the adjacent cell.  Otherwise (if blank) it does a VLOOKUP on the immediately preceeding value (one row above).

One problem with this is that it won't work if there are blank values in consecutive rows, like so:

A3: wcd.
A4:
A5:
A6: wcd.

B4 will do a lookup using "wcd.", but B5 will have nothing to lookup since A4 is blank.

-Glenn
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