Hi @dominono9
You can build a flow as shown below:

Here, first I have created a data table with the column headers using the following expression in a 'Set Variable' action:
%{ ^['Column 1', 'Column 2', 'Column 3'] }%

Then, I split my text into a list with New Line as separator using a 'Split Text' action to create a list with each of the row elements in the text file:

Next I iterate within this list element and the again use a 'Split Text' action for splitting the current row item with a comma separator:

For each iteration I will get a list called as TextList as shown below:

Now, in the end I just use a 'Set Variable' action again to add a new datarow consisting of all the items in the newly generated list to my original data table variable with the following expression:
%DataTable + [TextList[0], TextList[1], TextList[2]]%

My final output is as shown below:

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