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Please find my solution by join your data to itself using the key room = room as shown below
and then create the calculation field, if you just need the overlap cases, then drag the calculation field to filter and select 'Overlap'
Hope this helps
Thank you so much for the idea.
I did apply the same solution to my Problem. But it works in the crosstab. But I couldn't Show it in the graph.
This is my vs your graph: I couln't Show the difference for overlap in the graph. For me, it just Shows the Project with Long Duration in'Blue', the other Projects within this time range are not shown in Gantt. Please let me know, what am I doing wrong here.