Hi Divya,
Here you can take ABAP help to complete your requirement.
1. Create Write optimized DSO as per file structure.
2. Develop ABAP program to read txt file from an Application server & update file data to Active table of Write Optimized DSO.
3. Create transformation to map Write Optimized DSO to Infoobject.
4. After update of Data to Info object. Delete data from Write Optimized DSO.
Regards,
Pradip