Yes, each of the methods typically described for creating a conditional value list still work when you have a single table. For those conditional value lists that use a relationship, you can set up a self join relationship between two Tutorial: What are Table Occurrences? of your single table. Open Manage | database | relationships. Select the table occurrence box for your table by clicking it. Click the duplicate button (two green pus signs). You now have two occurrences of the same table that you can link in a relationship for your conditional value list. You can double click the new table occurrence if you want to give it a more descriptive name than the first occurrence's name plus a number.