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Extending with a dynamic cfc path

Using some cfcs in that are subdivided in the CFC directory.  For instance have myCFC and myChildCFC folders.  The myCFC folder contains myCFC.cfc and myChildCFC contains myChildCFC.cfc.  I'm trying to have myChildCFC extend myCFC.  But my root folder (call it myWebsite) needs to be dynamic, so could have myWebsite2 for instance.  I'm unable to put anything but a constant expression in the extends as it throws an error.  How do I get the extend attribute in myCFC.cfc to see the myChildCFC.cfc.  I tried extends="cfcs.myCFC.myCFC".  This doesn't seem to work.

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1 Solution
this works fine on my CF8 server:

folder structure:
/ - site root
/dev - sub-folder under site root
  files: test_com.cfm - testing page
/dev/com - main components dir
  files: myCFC.cfc - component that will be extended by the child component
/dev/com/childcom - child component dir
  files: myChildCFC.cfc - the cild component that will extend the min component

test_com.cfm page in /dev:

<!--- instantiate myCFC component --->
<cfset oMyCFC = createobject('component', 'com.myCFC')>
<!--- invoke f1 function from myCFC component --->
<cfset res = oMyCFC.f1()>
<!--- output result of f1 function --->

myCFC.cfc component in /dev/com:

<cfcomponent displayname="myCFC" extends="dev.com.childcom.myChildCFC">
      <cffunction name="f1" access="public" returntype="string">
            <cfset var myResult=f2()>
            <cfreturn myResult>

myChildCFC component in /dev/com/childcom:

<cfcomponent displayname="myChildCFC">
      <cffunction name="f2" access="public" returntype="string">
            <cfset var myResult="I am f2 function from myChildCFC component!">
            <cfreturn myResult>

test_com.cfm page outputs "I am f2 function from myChildCFC component!"

HyperBPPAuthor Commented:
This is reverse what I need.  You have myCFC extending myChildCFC.  However I need myChildCFC to extend myCFC.  Additionally I don't see that you would have the same issues as I do.  SInce myCHildcfc is in a subdirectory of the directory containing myCFC, myCFC should be to find it.  In my case, myChildCFC needs to access a file in a directory that is not a subdirectory of the directory it is in.  
sorry, i have misinterpreted your configuration...
in any case, the same principle should work: provide a path to the cfc you want to extent from web root.
if the cfc you want to extend is not under same web root as the cfc extending it, you will need to create a cf mapping to the folder containing that cfc: in CF Administrator got to Mappings (under Server Settings) and add a mapping to the folder containing myCFC.cfc. then in MyChildCFC the extends attribute should just use that mapping's name.

C:\coms\myCFC - a folder containing myCFC.cfc
/dev - website's root
/dev/com - folder containing MyChildCFC.cfc

Created CF mapping: Logical path: myCFC; Directorty path: C:\coms\MyCFC

Extends attribute in myChildCFC: extends="myCFC"


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