How to use features combine ?

I have a part and I would like to create the "negative" of it (it's to make a mold in the end).
So I open the part, I add an extruded boss/base and then I want to do a "combine substract" so that I can substract my part from the new extruded boss/base. When I look at "insert -> features" the "combine" button is grey (= I can't use it).

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I found the solution : when I added my second part, I forgot to uncheck the "merge" box and therefore I had only one part and not 2.

 
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