How to: Assign a Control a Value From a Table
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You can use the DLookup function to display the value of a field that is not in the record source for your form or report. For example, suppose you have a form based on an Order Details table. The form displays the OrderID, ProductID, UnitPrice, Quantity, and Discount fields. However, the UnitPrice field is in another table: Products. You could use the DLookup function in a calculated control to display the UnitPrice on the same form when the user selects a product.
The following example populates the UnitPrice text box with the price of the product currently selected in the ProductID combo box.
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The DLookup function has three arguments. The first specifies the field you are looking up (UnitPrice); the second specifies the table (Products); and the third specifies which value to find (the value for the record where the ProductID is the same as the ProductID on the current record in the Orders subform).