Some help with right filtering needed

[Khramana]

Hello Power BI masters!

Could I kindly ask you to give some advise how to set up right filtering?

I have a table that contains of several columns.
Example:

Ticket Number	Grade	Description
12345	A	Apple
54321	A	Orange
54321	B	Banana
54321	C	Peach
54321	C	Pear

Sum result shows 5


Briefly, there are 3 columns as an example: Ticket Number, Grade, Description.
Grade shows whether is a master ticket (Grade is always A for them) or a subticket (Grade is never A).

If ticket has no subticket - I need still to keep it as 1 item. Example ticket is 12345.
If ticket has subtickets like ticket 54321 (subticket's Grade is never A) - I need only to take subticket items of it. In other words, - to ignore parent ticket as an item for such case.

I think that solution is to type 1 of my conditials are met and 0 if not.
But I have some difficulties how to make the right DAX conditional expression...

Could you please advise?

Thanks a lot in advance!

[ChielFaber]

Personally I would change the code by Reza Rad to start with 0. I believe it will then look like this:

Table.AddIndexColumn([Count],"Index",0)

After that with step2 you need to again group all rows. You could follow  step1 from Reza again. Add All rows and then add a new aggregation:  max(Index).

[ChielFaber · Accepted solution]

You might try the following. I don't know if this is the best solution, but I think this might work.

A little adoptation of Reza Rad's create row number per group. 

The first step would be that  you follow the instruction on this blog page by Reza Rad:

https://radacad.com/create-row-number-for-each-group-in-power-bi-using-power-query

The only difference that I would suggest is to let the index number start at 0 (although 1 would work as wel).

After performing this step you get something like

Ticket Number	Grade	Description	Index
12345	A	Apple	0
54321	A	Orange	0
54321	B	Banana	1
54321	C	Peach	2
54321	C	Pear	3

After this you could do a regular group by through the UI. Choose advanced options to include all the columns. Don't perform a sum, but perform a max on the Index column.

Then you get something like this:

Ticket Number	Grade	Description	Index	numberofsubtickets
12345	A	Apple	0	0
54321	A	Orange	0	3
54321	B	Banana	1	3
54321	C	Peach	2	3
54321	C	Pear	3	3

After this step you could add a custom column. If index = 0 and numberofsubtickets > 0 then 0 else if 

index > 0 and numberofsubtickets > 0 then 1 else 1

Ticket Number	Grade	Description	Index	numberofsubtickets	Number
12345	A	Apple	0	0	1
54321	A	Orange	0	3	0
54321	B	Banana	1	3	1
54321	C	Peach	2	3	1
54321	C	Pear	3	3	1

After this you can perform a group by and sum on the number column and this will give the result your looking for.

[Khramana]

Hello @ChielFaber  !

Thank you very much, it seems to be really that I want!
But could I kindly ask you to explain the step 2 a bit more detailed?

When I right-click on Custom.IndexNew I replicates my ticket number, seems that I'm doing something wrong.

After the step 1 I have this result:

Custom.Ticket number	Custom.Grade	Custom.Description	Custom.IndexNew
12345	A	Apple	1
54321	A	Orange	1
54321	B	Banana	2
54321	C	Pineapple	3
54321	C	Peach	4

FYI: I chose index from 1, from 0 info was a bit mixed up after step 2 in the step 1 (sctions from the article)