FB3 Global Layout question

I am using CF10 and Fusebox3. I have a site that has a left navigation panel and this left nav panel is defined in a main directory file called layoutGlobal.cfm.

My fbx_Layouts.cfm file in the main directory references this file with the following lines of code:

<cfset fusebox.layoutDir = "">

<cfset fusebox.layoutFile = "layoutGlobal.cfm">

This works great for my entire site except that I now have a circuit (directory) that is to have it's own and different left navigation panel. How do I handle this? Do I put conditional code around the second <cfset> above? If yes, what should that conditional code look like?

Thank you.