Spliting the data in the next row in .txt file

Hi,

I have a sets of datas that look like this when I click on save:

0, 1, 2, 3, 4

Now when I click it again it goes stacking up like this:

0, 1, 2, 3, 4, 5, 6, 7, 8, 9

How do I make it so that when I click it it will start from another row instead of just doing it in a line? For example like this:

0, 1, 2, 3, 4
5, 6, 7, 8, 9

Are there any threads that I miss or not knowing the keywords in the search bar? Please guide me on this.

Thanks

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