In Excel, CONCATENATE function can convert the column list to a list in a cell separated by commas. Please do as follow:

1. Select a blank cell adjacent to the list's first data, for instance, the cell C1, and type this formula =CONCATENATE(TRANSPOSE(A1:A7)&",") (A1:A7 is the column you will convert to comma serrated list, "," indicates the separator you want to separate the list). See screenshot below:

2. Highlight the TRANSPOSE(A1:A7)&"," in the formula, and press the F9 key.

3. Remove curly braces {and } from the formula, and press the Enter key.

Now, you can see all values in the column list been converted a list in a cell and separated by comma. See screenshot above.

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If the CONCATENATE function is a little tedious for you, you can use a VBA to quickly convert the column list to a list in a cell.

1. Hold ALT button and press F11 on the keyboard to open a Microsoft Visual Basic for Application window.

2. Click Insert > Module, and copy the VBA into the module.

VBA: Convert column list to comma separated list

Sub ChangeRange()
'Updateby20140310
Dim rng As Range
Dim InputRng As Range, OutRng As Range
xTitleId = "KutoolsforExcel"
Set InputRng = Application.Selection
Set InputRng = Application.InputBox("Range :", xTitleId, InputRng.Address, Type:=8)
Set OutRng = Application.InputBox("Out put to (single cell):", xTitleId, Type:=8)
outStr = ""
For Each rng In InputRng
    If outStr = "" Then
        outStr = rng.Value
    Else
        outStr = outStr & "," & rng.Value
    End If
Next
OutRng.Value = outStr
End Sub

3. Click Run button or press F5 to run the VBA.

4. A dialog displayed on the screen, and you can select the column list you want to convert. See screenshot:

5. Click OK, then another dialog popped up for you to select a cell. See screenshot:

6. Click OK, and all values in the column list have been converted to a list separated by comma in a cell.

Tip: In the above VBA, "," indicates the separator you need, and you can change it as you need.

You can also apply Kutools for Excel’s Combine utility to combine a column list, and separate each value with comma easily.

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1. Select the column list that you will convert to a comma separated list, and click Kutools > Merge & Split > Combine Rows, Columns or Cells without Losing Data.

2. In the opening Combine Columns or Rows dialog box, you need to:
(1) Check the Combine rows option in the To combine selected cells according to following options section;
(2) In the Specify a separator section, check the Other separator option, and type comma , into following box;

3. Click the Ok button.

Now you will see all values in the specified column list are combined into one cell and converted to a comma separated list.

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Reverse concatenate and convert one cell (a comma serrated list) to a row/column list in Excel

Normally Excel users can apply the Text to Columns feature to split one cell to multiple columns, but there is no directly method to convert one cell to multiple rows. However, Kutools for Excel’s Split Cells utility can help you easily get it done as below screenshot shown. Full Feature Free Trial 30-day!