Follow these steps to start lumpsum (One-Time) on Groww:
1. Go to the mutual funds explore page
2. Select any fund of your choice or search for a fund
3. Click on 'one-time' on the fund page
4. Enter the amount you want to add
5. Check your phone/email for a 6-digit code you must have received
6. Finally, make the payment to start the lumpsum.