@^T [StuartBruff, Werner Exinger, Mike Armstrong]
Thanks for the great feedback. I liked the idea of Werner too, though admittedly it is not a good practice. But this comes from my initial bad design. I am still using MC v.11, so xml is not the standard format.
@Mike: I could uploaded my file, but in the essence I wanted to know how to handle a very simple case, like the one posted by Werner's image.
Thanks again.