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The steps to set up a drop-down list (also known as a combo box) in are typically as follows:
1.Open the form design view: First, make sure that your form is in the design view. If the form is open, you can switch to design view in the View option.
2.Insert a combo box: Find the Combo Box tool in the design toolbar (usually an icon that appears as a drop-down arrow), then click and drag on the form to create a combo box.
3.Set up a data source:
Use the wizard: If you enable the combo box wizard, it walks you through a few steps to set up your data source. This may include selecting a field from an existing table or query, or entering your own values.
Manual settings: If you are not using the wizard, you will need to set it manually in the properties window. Under the Data tab, set the Row Source Type (which could be a table query or a list of values), and then enter your data in the Row Source property (for a list of values, enter the values directly separated by semicolons; For a table query, enter an SQL statement or select a table query name).
4.Adjust properties: You can also set other properties such as the size of the combo box, its name, the number of rows (the number of rows displayed in the drop-down list), and so on.
5.Save and test: When you're done setting up, save the form and switch to the form view to test if the combo box works as expected.
Depending on your specific version of Access and personal preferences, the operation may vary. If you encounter problems during the setup process, you can refer to Access's help documentation or tutorial for more detailed instructions.