When a creation has more than one output, you can split one of those outputs into its own creation. You can publish that new creation immediately, or keep it as a private draft and publish it later.
Publish separately is available when all of the following are true:
Open the creation and select the output. Publish separately is a button on the image controls, and it is also in the menu on an output in the gallery.
The modal is titled Publish Separately. Make this new creation public is checked by default. The note says: You are publishing a single output separately. It will become a new public creation. The button is Save and Publish.
The new creation is public. On it, the line under the image reads Published individually from a creation by the original creator. If the original creation was private, it reads Published individually from a private creation by that creator.
An output that has already been published separately shows View published instead. That opens the creation that was split off.
In the same modal, uncheck Make this new creation public. The note changes to: You are copying this output to a new private draft creation. It will not be published. The button changes to Create draft.
The draft is saved in My Creations. It stays private and is not posted to Explore until you publish it. The line under the image reads Draft copied from a creation by the original creator, or Draft copied from a private creation by that creator when the original was private. After you publish the draft, that line changes to Published individually from.
What's New includes a short note titled Publish separately: keep it private.
Each creation can only hold a limited number of outputs. When it is full, another edit on that same creation is blocked until you continue on a new draft. You will see this on:
The message is: This creation has reached the limit of outputs - to make this request, copy this output to new draft creation.
Choose Copy to draft. NightCafe copies that output into a new private draft and opens it. A confirmation says: Copied to a new draft creation. You can continue editing there. Run the edit on the new draft.
If you copy several outputs in a short time, you may see: You are copying outputs to drafts too quickly. Please wait a minute and try again.
Publish separately is not offered on the image grid, and a grid cannot be copied to a draft. Select a single image first. If you publish the whole creation while the main image is still the grid, the publish modal says you are publishing the image grid and links you to choose one image as the main image.
New creations, including these drafts, are private until you publish them. See Are my creations private by default?