I have already gone through these blog, but couldn't understand much.
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Its quite simple and straight forward,
You need to have an additional data source along with your primary source, having one integer field called Point. And it'll have value from 1 to 180. Like this
If you're using excel as data source then you can put both sources in a single excel file. After that connect the file and join both the sources.
Joining condition should be 1=1.
Once done then you're good to go. Rest of the calculations are self explanatory in the workbook link.
Hope this will help.