Copy a column from Table A to Table B

Hi
I thought this would be an easy one.
But after many attempts and lots of forum reading, I can't find a solution. Probably just me who is new to Power BI and DAX.

So how do I copy a column from Table A to Table B?
The column I would like to copy is a calculated column.
So doing it in Power Quray I don't think will work.

Thanks in advance