There are at least two ways to do this:
1. As described by Pat, you know before you start what the contents of the EJB will be and you construct a composite made up of the pieces that you want to place in different locations.
2. Alternatively you may not know the make up of the EJB at the start, and as part of your design process you are adding to it as you go along. In this case, place down each of the symbols as you need them and then use "share into" to make them part of your EJB.