Code option of placing multiple values ​​in one cell (via a list box)

Hello everyone,

In the columns of my Excel sheet I have created list boxes.
I would like a few specific columns to have the option of placing multiple values ​​in one cell (via a list box). For other columns it is required that only one value will be placed in the cells.
Searching through links mentioned on this forum led me to the "View Code" option on the tab of the sheet. There I found the code below. It indicates that only column 17 offers the option of placing multiple values in one cell. What changes can I make in this code to ensure that also column 20 and 21 get the option?

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Can anyone help me? Thanks in advance!
Kind regards,
P

(Sorry, I cannot add an example Excel sheet, because the document is from my work which has privacy related writings in the properties of the document, and which I cannot remove. At home I don’t have Excel, so I cannot recreate an Excel sheet. I hope this will not be a problem and that I have described my problem sufficiently.)

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