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Creating a calculated control field with Expression Builder. Using the Expression Builder can eliminate expression syntax errors. Click the Build button next to the Control Source property for an unbound text box; this automatically opens Expression Builder. Next, click a form name and a form field to select a term in your expression. Click Paste once you correctly specify it. Then, click an operator, such as +, /, or *. Repeat this process for as many terms as necessary to complete the expression. Then, click OK to paste the expression back to the form in Design View.
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