Unfortunately, Word does not provide a way for you to change how many decimal places are displayed when working with numbers. While there are ways to work around this limitation, the best solution is to include a switch in the merge field.
What Is a Switch?
Field code switches allow you to modify the resulting data that you merge into a document. There are two types of switches in Word:
General switches help you format the data. For instance, you could use a general switch to select uppercase letters.Field switches are field-specific, changing the behavior of the fields to which they are applied.
All switches begin with a backslash, followed by a character (or characters) that describe its function. A Numeric Picture Field Switch (#) determines the display of a numeric result.
How to Perform The Numerical Switch Function
Learn how to use the Numeric Picture Field Switch (#) to specify how many decimal places to display in your Word mail merge. Your number will appear rounded to the decimal place you specify. If it does not display immediately, refresh the document by minimizing it to the toolbar and reopening it. If the field value still does not display correctly, you may need to refresh the document again or close and re-open your document.
0 for rounded whole numbers 0.00 if you want to round the number to two decimal places (or 0.000 if you want to round the number to three decimal places and so forth),0 for rounded whole numbers with a thousands separator
