Kindly follow these steps:
1. Insert a Button and OnSelect of the Button, Create a collection, say "MyTableColl":
ClearCollect(MyTableCollect,DataSource )
2. Insert a DataTable and Use the Name of the Collection "MyTableColl" as the Datasource of the DataTable
3. Insert Another button and use this formula OnSelect to Collect the entries on the form into MyTableColl:
Collect(MyTableCollect { Column1: Dropdown1.Selected.Value, Column1: Textbox1.Text} )
4. You can hide/show the Datatable based on a button
Replace the dropdown1 and Textbox1 with the actual names on your form
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