Within Rhinoceros I use a special function that passes the geometry to Spaceclaim back and forth.
It works with a simple line command (or an assigned button).
Is not possible to design everything with Fusion360 but many direct modeling functions are super powerful and not available in Rhino.
For example in Rhinoceros we can't delete 3d fillets.
Because my 3d modeling starts from Rhinoceros and I optimize the final work in Spaceclaim I'd like to have the same function in Fusion360.
best regards