Adding empty row to repeating group

I am working on a system where there is a medical record, Now the thing is, every record can have multiple medicines, every medicine have three attributes. Now the problem is I am really confused how to add empty row in repeating group’s list on button click (Add medicine button). I cannot add it to parent’s thing because that’s also empty. I have show the interface below. Note that in repeating group the input fields are bind to parent’s cell’s thing

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I saved them in database and there was a field that remained empty that gets filled after whole record is added that how I was able to do my task