Mark
Fairly a long time since I asked the question. As you are familiar with my set up, I would like to restrict the choices in a field based on another field. So do I need to establish separate tables. In this case you might wish to read my following earlier note:
"I have field Development Type, which has three values to choose from. These are long descriptions. Then I have a Development Code field in the same table. These are two letter codes corresponding to Dev Type. For example, a refurbishment is always known as RR and extension is RE. What I want the user is to select the dev type and the dev code shows the right code for that. In MS Access, I could achieve it without having to save a table.