Merging Clutter classes


I have what we call clutter data. Basically, a geographical area is assigned colors and attributes. 
For example, a residential area is assigned a color of red and a code of 5 and an industrial area is assigned yellow color and code 6 and so on.
What i am trying to do is merging multiple areas. lets say there are areas with codes 4, 5 and 6 and different colors. I want to assign one code to all of these categories. lets say code 7 to represent 4,5 and 6 all with the same color. How can i achieve this in global mapper?



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