Make first few rows unresponsive to slicer Power BI - powerbi

Question

I have a data which looks like below:
Brands Sales Category Index
Brand1 588 A 1
Brand2 846 A 2
Brand3 827 A 3
Brand4 951 A 4
Brand5 673 B 5
Brand6 637 B 6
Brand7 575 B 7
Brand8 995 B 8
Btand9 737 C 9
Brand10 661 C 10
Brand11 729 C 11
Brand12 789 C 12
Brand13 836 C 13
Problem statement :
I am trying to put Category as a slicer. However I want the rows for Category A to be present in the table view irrespective of the slicer which is selected.
Example: Lets say if Category B is selected in slicer , in this case the table should return all rows until Rank 8.
Below is an example of the desired output when category C is selected:
As you can see, the visual table has both Category A and Category C.
Similarly when both B and C are selected, I should be able to display all the categories (A,B and C).
What tried:
I was thinking if we can use a conditional DAX which return 1 for selected values in slicers and mark rest as 0, I could use that as a visual filter and filter out 0. I tried various combinations of Filter with in Filters and SELECTCOLUMN but it did not work. Even the below measure returns all the rows instead of Selected values|| category="A"
test1 = CALCULATE(MIN('Table'[Index]),FILTER(ALLEXCEPT('Table','Table'[Brands]),'Table'[Category]=SELECTEDVALUE('Table'[Category]) || 'Table'[Category]="A"))
I also tried something like:
test = var cat = min('Table'[Category]) return IF(cat = SELECTEDVALUE('Table'[Category])||cat="A",1,0)
But this gives all as 1 , doesnot give 0 for rows which does not match the condition (note I have blocked the slicer interaction here)
Any help would be highly appreciated.

Answer 1

First, you need to separate your slicer table as keeping the value in the same table you can not achieve the requirement. You can create custom table with this below code-
considering your base table name sales
Lets create the custom table category list
No relation can be there between table sales and category list
category list =
SELECTCOLUMNS(
sales,
"Category",sales[Category]
)
Now, create the slicer using new custom table category list and create this below Measure-
is filter =
if(
MIN(sales[Category]) = "A",
1,
if (
MIN(sales[Category]) IN VALUES('category list'[Category]),
1,
0
)
)
Here below is a sample output when C selected-