Let’s start with a dataset that has sales orders. There are sales order lines:

And the data looks like this:

However, there is no extended price in this dataset. To calculate it, let’s add a new calculated column. Click on the ellipse on the dataset:
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And select New column:

Add the formula:
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The new column will appear in the dataset:

And the new column can be added to our Power BI table:

You can then use that calculated column in measures:
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And other calculated column calculations:

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