This is the workaround I could do
Please find the attached workbook.
1) Difference : Created a New Field that should be RUNNING_SUM(SUM([Sales]))-RUNNING_SUM([Cost])
2) Drag this Difference to Size
3) Create another Axis for Running Cost and then make it Dual
4) Note : You can adjust Size by Clicking on individual Lines (So making one Thicker and another Thinner )
SIM_Shade Between the lines.twbx 239.5 KB
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Hi Uta cho,
I could not view the workbook you have attached as I am using an older version of Tableau. however I was able to recreate what you have pasted in the image above. I have created some dummy data for the same.
Here is the workbook url : Shade Difference Area