Can you explain the e-billing, e-invoicing, and GST filing services?

Here are the steps to be followed for filing gst returns:
Note : Make sure to mention gst no. in the field of GSTIN and specify gst portal username in the same field in GST/VAT feature
Step 1: Go to display menu 
Step 2: Click on Gst reports 
Step 3: Then click on Gst returns 
Step 4: Then click on GSTR e-return 
Step 5: Then select particular method to upload return 
Step 6: Then specify date range and check possible errors if any then resolevd it 
Step 7: Then proceed to generate return 
To enable E-invoice feature 
Step 1: Go to Administration Menu
Step 2: Click on Configuration Menu
Step 3: Click on Feature and Option
Step 4: Click on GST/VAT 
Step 5: Enable E-invoice Required option as Y
Step 6: Then mention the required details and then click on GSP configuration
Step 7: Mention valid GSP credential of Webtel Electrosoft Private Limited and Pinnacle Finserv Advisors Private Limited generated from e-invoice portal and save the configuration by click on save button
Step 8: Go to Voucher series configuration from configuration Menu
Step 9: Select voucher and series then click on voucher configuration option 
Step 10: Enable Input Transport Detail as Y
Step 11: Enable Generate E-invoice after saving option as Y then save the configuration
Step 12: Then you can create invoice and e-invoice directly from BUSY