Create a Custom Sequence using 'DESKTOP'
Am I correct in understanding that I cannot create custom settings for a new project?
You're correct. You don't create custom settings for a project, because a project has no particular flavor or format. It is a container for sequences, which CAN have custom settings.
Go to File > New > Sequence; click on the General tab, and change the Editing Mode to Desktop. Change the other parameters as required for your output. Save a preset. You're done.
EDIT: Craig is The Steak; I'm The Sizzle.
He will be the Red Wine!
Thank you so much all for your help. Going through Desktop Settings was, of course, the trick.
Up and running. Thanks again.