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Hello Ayush - Tableau has a wonderful feature to Pivot the data. But I wonder if that will work for 350+ columns (I have never tried myself before). But You can try that out.
Tableau works fantastic on row level measures. If Tableau Pivot doesn't work, then you need to take help from any database / ETL tool help to prepare data in row format. Right Data preparation is always a painstaking critical task and most of time become determinant the sustainability of success !
I hope I understand your request correctly.
Assuming you are using 9.0 or higher version, you can use "Pivot" functions.
many_linies_Pivot_9.2.twbx 77.4 KB