changing value of custom property via script

I've setup a custom property for our on-call rotation.  I can change this custom property via the SolarWinds Orion gui.  It's 600 nodes presently and will only get larger.  Is there a way to script the change of the value of a custom property or manage it via the command line?  I presently have the custom property setup as a drop down list and I checked out what it would be like to do an on-call change and you have to highlight all the nodes that our team is responsible for and edit the properties.  With 600 nodes it takes a while for the gui to handle the change.