Hi Arun,
There is no funcionality avaiable to create notifications for multiple materials in background. You need to use some upload programs or QM01 to create notifiations.
Suggest to use BAPI_QNOTIFICAT_CREATE and develop the logic to create the notifications based on the file. Try to create a folder in AL11 and place the upload file. Schedule the background job every day to read the file from AL11 folder and create notifications in system.
Thanks & Regards,
Ramagiri