Showing multi list and drop down hierachy on page

We are dealing with Roles and assigning users to the Roles. Some of Roles which are Admin are not dependant on Context ( Environment - Production, Demo, Developement ), and some ( portal roles) are dependant on Context. So in the flow, we chose a Role and assign Users as below :

Flow : 1. User selects a role from left 2. Then selects a context 3. Select Users from Available users list and assign to Role

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Portal Role having single context

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Portal Role having multiple Contexts ,you can select from dropdown and then assign Users

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So any advice or suggestions to make it more understandable the flow to users? This was created by other designer and I have to modify it to make it better.

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