How to create a nested pcell but still maintain the strecth handle capacility?

Hi,

How to create a nested pcell but still maintain the strecth handle capacility?

I'm developing a nested pcell which instantaite a native transistor pcell, and add some routing on top of it. But, this will disable the stretch handle that i previously build intransistor.Is there a way i can create a nested pcell and maintain it existing stretch handle capability?

Many thanks