One Option:
Setting a dynamic variable name:
<cfset variables["GC" & AID] = "Testing" />
Output the value of the dynamic variable name:
<cfoutput>#variables["GC" & AID]#</cfoutput>
Another Option:
Setting a dynamic variable name:
<cfset variables["GC#AID#"] = "Testing" />
Output the value of the dynamic variable name:
<cfoutput>#variables["GC#AID#"]#</cfoutput>