How to make categorize items in table in PowerBI visualization - powerbi

I am new to Power BI and I am wondering how can I do something similar to the picture I have posted below. Like how can I categorize some items under a certain category?

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I want to use filters and DAX to hide pages that do not have filter data for a report. Is there any method for that?

Power BI use filter to select metric in matrix table

Currently I have 2 matrix tables that show 2 different metrics, like shown below. Is there a way I can combine these tables into one by adding a dropdown filter to select which metric I want to view?
The data is like the image below. The model in the current power BI is kind of complex, so I would prefer not to melt the table.

How to add calculated column to PowerBI datasets

I have created a dataset in Power BI web, and then imported it on Power BI desktop (using File -> Get data -> Power BI datasets).
I don't see a way of adding Calculated Columns. Does the dataset need some special configuration to enable this?
Based on my experience you won't be able to see the columns because it using direct query. you can still add some columns and measure but your'e basically flying blind. you can just select the table in the report(visual view) and add column however you'll have to play the guessing game. But if you know your dataset you should be fine.
However a Dataflow wouldn't give the issue you're having.

Power BI - Filtering a Table based on selection in a Bar Graph

I'm pretty new to Power BI.
I have a number of measures I've created in my Power BI app, data related to information requests that come to my team.
I've put these measures into a Bar Chart. I also have a table that lists details about these data requests. I want to be able to select an item in the Bar Graph and have the records in the Table to adjust to just those related to the selection.
I did this once by accident when i was fiddling around, now I can't figure out how i did it.
I also have a date filter set to affect all of my pages.
Any advice would be awesome.
Thanks in advance.
Jason
Try going to Model (highlighted in the screenshot, left side) and then Manage Relationships (highlighted as well). Then click on Autodetect. If Autodetect does not solve your problem, then you will have to create new relationships manually.

How to achieve Column level Security in Powerbi?

While working on Power BI, I have to show few columns from TABLE visual to specific set of users and hide for others.
So, till now I have created two ROLE in Power BI and added users but unfortunately, I am not able to hide and show TABLE Columns as per ROLE.
At this point - Column Level Security and Hiding Columns is not something one can achieve with Power BI.
Kindly see this Post on Power BI Ideas.