Concatenate list values without losing previous cell value

[YSFG]

Hello,

I have an excel sheet that contains a list ( 1, 2, 3, 4)

Can I do this operation :

when I select "1" from the list, I should have another cell that contains "1"
AND IF I select "2" from the list, the cell should contain "1 2 " NOT ONLY 2, which means it conserves the previously selected text from the list!
is this operation possible with Excel?

I hope you understand the situation.
Thank you in advance.

[KOKOSEK]

Let say list is on B2 and destination cell is D2:

Capture.PNG

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