Help with adding column to table (one-to-many relationship filter)

Hi,

to obtain this table

you have to:

In Table B

- Group by 

- then add custom column

- expand Custom

and now Table B looks like this:

You can remove Column Count.

Then in Table A:

- Merge query

- and finally Expand Table B

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Thanks for the suggestions! This is really helpful! Another way I discovered was to add a new column using DAX:

LatestEvent = var _id = [ID]
var _lastDate = CALCULATE(MAX('Table B'[Date]),'Table B'[ID] = _id)
return
calculate( MAX('Table B'[Name]),'Table B'[Date] = _lastDate && _id = 'Table B'[ID])