User Guide Create and configure a study (Optional) Create predefined sets of drop-down list options, radio buttons, or checkboxes (codelist subsets) in a study Step 3: Require study designers to select subsets when they are defined for a codelist (Optional) Step 3: Require study designers to select subsets when they are defined for a codelist (Optional) At the bottom of the Project Explorer, click the Study Information () button. In the Project Explorer, select the study name. Make sure the General tab is selected. In the Study Restrictions section, select Require codelist subset selection. Tip:This setting applies to the entire study. Therefore, a study designer who uses a codelist with defined subsets must select a subset. Parent topic: (Optional) Create predefined sets of drop-down list options, radio buttons, or checkboxes (codelist subsets) in a study