How to use a language from another language

I defined a language A and now I want to define a language B which uses language A. The idea is to references the concepts in A. At the end I want to have in a solution instances the A and B, the instances of B with references to instances of A. My problem is that I don't know how to specify that B uses A. I tried the obvious option of Used Language in Model Properties but it is not working.
To be clear let say that we have in A
   concept X implement INamedConcept
and in B
   concept Y
   X x 1..1
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In MPS, you need to 'extend' the language A. Same dialog, but part 'Extended Languages' at the buttom.


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