To export the scene/selection as a .usd file enable .ass/.usd File in Render Setup: Arnold -> Archive.

 

Path

Object Path

Frame

Clear Controller

By default, the frame parameter is linked against the animation timeline frame. This button unlocks that link.

Namespace 

This custom namespace can be used instead of the procedural name, to reference contents through absolute or relative paths.

Debug

Up Axis:

The Up Axis for the procedural. Z is the default.

Select Operator

Viewport