how to add a new column in a dimension?

[test]

Why I have only expand/collapse in the colums ? how to add a new column in a dimension?

[Anonymous]

Hi @test,

Agree with Eno1978.

The feature that create new calculated fields/measures on top of a live SSAS connection is under review, you can vote it in the following ideas.

https://ideas.powerbi.com/forums/265200-power-bi-ideas/suggestions/11685723-create-calculated-measur...
https://ideas.powerbi.com/forums/265200-power-bi-ideas/suggestions/10299933-new-calculated-fields-ag...

Thanks,
Lydia Zhang

[Seth_C_Bauer]

@test From the look of it, you are connecting using a live connection to a model/cube. You can't add anything additional in PBI when using this connection type, you need to do it in the source.

For some additional info on connection types, check out a blog I wrote on it here