How to easily concatenate text based on criteria in Excel?

Supposing I have a column of ID numbers which contains some duplicates and a column of names, and now, I want to concatenate the names based on the unique ID numbers as left screenshot shown, to quickly combine the text based on criteria, how could we do in Excel?

Concatenate text based on criteria with User Defined Function

Concatenate text based on criteria with Kutools for Excel

Concatenate text based on criteria with User Defined Function

To combine text with the unique ID numbers, you can extract the unique values first and then create a User Defined Function to combine the names based on the unique ID.

1. Take the following data as example, you need to extract the unique ID numbers first, please apply this array formula: =IFERROR(INDEX($A$2:$A$15, MATCH(0,COUNTIF($D$1:D1, $A$2:$A$15), 0)),"")，enter this formula into a blank cell, D2 for example, then press Ctrl + Shift + Enter keys together, see screenshot:

Tip: In the above formula, A2:A15 is the list data range you want to extract unique values from, D1 is the first cell of the column you want to put out the extracting result.

2. And then drag the fill handle down to extract all unique values until blanks displayed, see screenshot:

3. In this step, you should create a User Defined Function to combine the names based on the unique ID numbers, please hold down the ALT + F11 keys, and it opens the Microsoft Visual Basic for Applications window.

4. Click Insert > Module, and paste the following code in the Module Window.

VBA code: concatenate text based on criteria

Function ConcatenateIf(CriteriaRange As Range, Condition As Variant, ConcatenateRange As Range, Optional Separator As String = ",") As Variant
'Updateby Extendoffice
Dim xResult As String
On Error Resume Next
If CriteriaRange.Count <> ConcatenateRange.Count Then
    ConcatenateIf = CVErr(xlErrRef)
    Exit Function
End If
For i = 1 To CriteriaRange.Count
    If CriteriaRange.Cells(i).Value = Condition Then
        xResult = xResult & Separator & ConcatenateRange.Cells(i).Value
    End If
Next i
If xResult <> "" Then
    xResult = VBA.Mid(xResult, VBA.Len(Separator) + 1)
End If
ConcatenateIf = xResult
Exit Function
End Function

5. Then save and close this code, go back to your worksheet, and enter this formula into cell E2, =CONCATENATEIF($A$2:$A$15, D2, $B$2:$B$15, ",") , see screenshot:

6. Then drag the fill handle down to the cells that you want to apply this formula, and all the corresponding names have been combined based on the ID numbers, see screenshot:

Tips:

1. In the above formula, A2:A15 is the original data which you want to combine based on, D2 is the unique value you have extracted, and B2:B15 is the name column that you want to combine together.

2. As you can see, I combined the values which are separated by comma, you can use any other characters by changing the comma “,” of the formula as you need.

Concatenate text based on criteria with Kutools for Excel

If you have Kutools for Excel, with its Advanced Combine Rows utility, you can quickly and conveniently concatenate the text base on criteria.

After installing Kutools for Excel, do as following steps:

1. Select the data range that you want to combine based on one column.

2. Click Kutools > Merge & Split > Advanced Combine Rows, see screenshot:

3. In the Combine Rows Based on Column dialog box, click the ID column and then click Primary Key to make this column as the key column that your combined data based on, see screenshot:

4. And then click Name column which you want to combined the values, then click Combine option, and choose one separator for the combined data, see screenshot:

5. After finishing these settings, click OK to exit the dialog, and the data in column B has been combined together based on the key column A. See screenshot:

With this feature, the following problem will be solved as soon as possible:

How to combine multiple rows into one and sum duplicates in Excel?

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Demo: Concatenate text based on same cell in another column with Kutools for Excel