You can combine text from multiple cells into one cell in Excel using the Ampersand symbol (&) or by using the CONCATENATE function.

When you want to combine values in Microsoft Excel, instead of complex expressions or VBA, opt for Power Query – it’s fast and easy.

Press "Ctrl-C" and then highlight the cells that you'd like to contain your drop-down list. Right-click one of the cells you highlighted and click "Paste special." ...