...
Click on 'ENTRY' and note how the right hand side (RHS) now shows attributes for this archetype node. Now right click on 'ENTRY' and go Add Local Term. Give the it the name 'BMI'. Notice this now appears in the bottom pane. We need to change the Local Code to a new at code - namely 'at0000'. You can do that by double clicking on 'at0002' and typing over it. Click then in the same row to commit it, then go to the RHS for the ENTRY node again up above where you were and change the at code again for where it says LocalCode. Don't worry that the local term has now temporarily disappeared on the LHS. It will come back.
Right click on Items Select Items and then right click and go Add Element, do this four times.
...