Unable to create Ossias

According to Dorico, you select Edit>Staff>Ossia above/below.

Staff option does not appear when I select Edit.

The Edit menu was reworked in Dorico 4 (in tandem with the contextual menu becoming genuinely contextual). The Dorico 4 manual states that it’s now Edit > Notations > Staff, here: Adding ossia staves

Are you using Dorico Pro or Dorico Elements, @SleepyinSeattle2? Extra staves and ossias are only available in Dorico Pro.

Pro. The question has been answered.
Thanks for asking.

Great, I’m glad you’ve got it sorted out.