Create a group based on row count

Question

I am looking for a way of reducing the size of tables I am displaying in my monthly report, by counting some rows together, and naming them 'other'
I would like to always show all rows, where count of item is >= 50, but all rows where count of item < 50, total up and call 'other'.  I will add an example image as soon as my account has been verified
I can hide rows using this in the visibility =iif(Count(Fields!Item.Value) >= 50, False, True)
I have duplicated the line, and added a filter to each (one for greater than 50, one for less than 50) but my totals are still counting all the data, and not just the filtered data.
Ideally, I would like to add a column using something like =iif(Count(Fields!Item.Value) >= 50, "Over50", "Under50"), or a group based on the same sort of idea, but I keep getting errors about using aggregates in columns.
Any suggestions?
Cheers

Answer 1

What you can do is to add derived column in query behind like this
SELECT other columns...,
CASE WHEN Cnt >= 50 THEN YourGroupingField ELSE 'Other' END AS GrpName
FROM
SELECT *,COUNT(1) OVER (PARTITION BY YourGroupingField) AS Cnt
FROM Table
)t
Then in your reports use =Fields!GrpName.Value as the Grouping column and you will get required output
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