Help needed with multiple selections from a created list - vba solution??

HI EXCEL COMMUNITY! I would like to be able to select multiple items from a list. In the attached file, I have my list, cells A3-A6. In cell C2 I have the option to select from a list. I would like cell C2 to show like cell F3. I would also like it to be available to the entire workbook. I have this programed so far in the VBA of the Workbook for columns 3 & 4, see below. However, the output isn't giving me the results I desire. Am I writing the VBA code incorrectly?

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Welcome to the forum.

We would very much like to help you with your query, however you need to include code tags around your code.

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If anyone has another formula or VBA code that is different from the one I posted above, please share it. Any help is much appreciated.