You can just create a Project report .
Add tests subreport.
In filter select a condition:
[Filter]{
TableName:TEST,
ColumnName:TS_SUBJECT,
LogicalFilter:^Subject\1^,
VisualFilter:^Subject\1^,
NO_CASE:
}
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So even having tree structure like this:
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I will still see all 6 tests, although they are on different depth in a tree, - all of them are under Subject\1 folder.