How to make added rows calculate?

Hello There,
I'm using the invoice template and I have figured out how to add rows "quantity, unit price, total" but how can I make them calculate? If I type qty 5 and the unit price 10.00 it doesn't give me a total of 50.00 like the rows that were in the original template.
Thanks for your help.
Mike

They give you the basics in the User Guide. Actually more than the basics once you get accustomed to it and are able to recognize the more subtle tricks in the examples. But, there will still be some features that may be missed. Makes using the program a bit like an Easter Egg Hunt. We all like those, don't we?
Jerry

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Code:
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How to make added rows calculate?

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