Hello studio del rosario,
In Maxwell 4, as you have pointed out, you can create emmiter by grouping an element, and applying an emitter material to it. Then you have a few option for hidding it (totally from render, from camera, from reflections, etc..) in the right-click context menu.
In Maxwell 5 is a bit different now. You can create emmiters automatically with the new Emitters Shortcuts in the main toolbar (Plane and sphere emmiters, HDRI, Spot, Projector and IES).
SketchUp Light Tools.png
Then, hide options have been moved to the "Object Properties" panel. You can access them through the main Tool Bar as well.
SketchUp Object Properties.png
Any further questions, please do not hesitate in contacting us.
Cheers!
Alberto.
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