replace data from sheet

[1MooreMike]

Hi Everyone -

I use this often to replace data on my sheet:

<code style="margin: 0px; padding: 0px; font-style: inherit; font-weight: inherit; line-height: 12px;">Private Sub Update_EstDelv1()
Dim lr As Long, I As Long
Dim x As Variant
lr = Range("A1").End(xlDown).Row
For I = 1 To lr
    x = Application.VLookup(Cells(I, "A"), Workbooks("Reference.xlsx").Sheets("Sheet1").Columns("A:BX"), 23, False)
    If Not (IsError(x)) Then
        Cells(I, "W").Value = x
    End If
Next I
End Sub
</code>

Column A is common between all sheets. The above replaces data, so if I have a line (Unit #) in Column A in Book2 that isn't in Book1, it makes everything blank on that line - I want to keep existing data and only replace data points that exist in Book2.

Basically, I want to develop a macro that when I run with book2 open, it updates the units (Column A) in Book1 based on data from Book2, but leaves the other 'units' (Column A) alone.

Any suggestions?

 

[Fluff]

Cross posted https://www.excelforum.com/excel-pr...3295-replace-data-from-sheet.html#post4911861

Cross-Posting
While we do not prohibit Cross-Posting on this site, we do ask that you please mention you are doing so and provide links in each of the threads pointing to the other thread (see rule 13 here along with the explanation: Forum Rules).
This way, other members can see what has already been done in regards to a question, and do not waste time working on a question that may already be answered.