Civil 3D Strip - Merging / Grouping Geology Code

I am modeling a site with the Civil 3D extension. The borings were logged with layers based on USCS. A legend code was then assigned to each of the USCS layers and then a geology code was assigned to each of the layers. In most cases, except for Fill / Made Ground and Rock, the Legend Code is the same as the USCS. However, the geology codes are not, and usually encompass several layers. Is there a way to merge layers with the same GEOLOGY code to clean up the plan strips? In the example shown below, I would like to combine the top fill layers into one fill layer. Similarly, I would like to combine the bottom two BBC layers into one layer. Is this this possible?