F5 APM DHCP instead of leasepool

Hello,

I'm looking to configure the APM to use an upstream DHCP server instead of the locally defined leasepool.  

I have seen in other posts a link to an article for just this, but the link is no longer around and I cannot find the iapps template associated.

iApp, documentation, and example APM Policy to get IP addresses from DHCP for APM VPN clients

Can someone point me to the correct link, or can someone tell me the proper way to do this?  When i remove the leasepool from the APM policy it says no leasepool assigned and the connections fail.

Thank you.