Hi Vishu,
You have 2 options:
1. Generate Excel table from your text file with EPMSaveComment functions
2. Write a badi to store comments in the comments table.
Vadim
P.S. Just search forum - a lot of info about comments copy/upload
P.P.S. To find the comments table name use UJ0_GET_GEN_TABNAME in SE38
Try to use simple ABAP code to write the comment directly in the ABAP table from excel File.
Excel Upload to ABAP table.
it should work
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