如何用宏或条件格式实现：若B列值为Yes则替换A列对应值为Yes

Got it, let's break this down for you. First, a quick heads-up: Conditional Formatting can’t actually edit cell content—it only changes how content is displayed. So if you need to permanently replace the text in Column A when B is "Yes", you’ll want either a VBA macro or a helper column. If you just want to show "Yes" without altering the underlying value, Conditional Formatting works. Let’s cover all bases:

This is the direct way to update Column A’s values:

• Open your Excel workbook and press Alt + F11 to launch the VBA Editor.
• Right-click your workbook in the Project Explorer pane > Insert > Module.
• Paste this code into the new module:

Sub UpdateColumnA()
    Dim targetSheet As Worksheet
    Dim lastRow As Long
    Dim rowNum As Long
    
    ' Replace "Sheet1" with your actual sheet name
    Set targetSheet = ThisWorkbook.Worksheets("Sheet1")
    
    ' Find the last row with data in Column B
    lastRow = targetSheet.Cells(targetSheet.Rows.Count, "B").End(xlUp).Row
    
    ' Loop through each row to check Column B
    For rowNum = 1 To lastRow
        ' Case-insensitive check for "Yes" (works for YES/Yes/yes)
        If LCase(targetSheet.Cells(rowNum, "B").Value) = "yes" Then
            targetSheet.Cells(rowNum, "A").Value = "Yes"
        End If
        ' No action needed if B isn't "Yes"—keeps original A value
    Next rowNum
    
    MsgBox "Column A updated successfully!", vbInformation
End Sub

• Tweak "Sheet1" to match your sheet’s name if needed.
• If you want the check to be case-sensitive (only trigger for exact "Yes"), remove the LCase() function.
• Run the macro by pressing F5 in the VBA Editor, or assign it to a worksheet button for one-click access.

If you prefer avoiding VBA, use a helper column to generate the updated values:

• Insert a new column next to Column A (e.g., Column C).
• In cell C1, enter this formula:
  =IF(B1="Yes", "Yes", A1)
• Drag the fill handle (small square at the bottom-right of C1) down to apply the formula to all rows with data.
• To make the changes permanent in Column A: Select Column C, copy it, right-click Column A > Paste Special > Values. You can then delete Column C if you don’t need it anymore.

If you don’t need to alter the actual value in Column A—just want it to show "Yes" when B is "Yes"—Conditional Formatting is perfect:

• Select the entire Column A.
• Go to Home > Conditional Formatting > New Rule > Use a formula to determine which cells to format.
• Enter this formula: =$B1="Yes"
• Click Format... > Go to the Number tab > Custom > Type "Yes" in the Type field.
• Click OK twice. Now, whenever B has "Yes", A will display "Yes" (but the original value remains in the cell—check the formula bar to confirm).

内容的提问来源于stack exchange，提问作者sara