How to make a default values ❤️ {UPDATED 2023}

I have county names as dublin1, dublin2, dublin3 how to make a single default name as dublin to those values in power bi?

I have tried to remove duplicates but it is not a correct solution.I have tried concatenate as well but it will be useful to merge columns.

Update your question with a sample table in markdown format together with what the result you want.

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You will need a Table similar to:

You would then add a relationship on the second column to your data table(s). Lastly, you’d use the first column for your slicer.