Hi
Do you mean going into a site that's already been harvested for stump and slash? Or could it be one event?
If you use the Forest Carbon Succession extension and Base Harvest you can harvest merchantable wood biomass, other wood biomass (tops, stumps, branches and small trees). You can also harvest deadwood pools: coarse woody debris, stem snags and snag other wood.
I don't know of any way to get Base Harvest to target an event on a site that's already been harvested, but that doesn't mean its not possible. :)
cheers
Caren