The next thing we want to do is to insert a step to extract the number of each tip.
In the Browser View, right-click on the tip number, and select the menu item “Extraction” | “Extract Number” | “Tip.number”.
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A dialog for extracting a number now appears. Make sure the Convert to Integer checkbox is checked.

Click OK to close the dialog. Have a look at the Objects View (in the lower right corner), where you can see the objects and the values of their attributes. You will now see that the number attribute of the Tip object, as expected, has the value 4.