Page template inheritance

Hi,

This may have been asked before but:

I’ve created my own custom page template in my child theme (parent is suffusion) and I wish to inherit the double sidebar from a particular parent page template.

Is it possible to inherit the layout from a particular parent page template? I don’t want to override it I just want to use the same underlying layout and fill it with my stuff.

It’s likely that I’ve missed something simple.

Thank you very much in advance.