How do I merge class sections?
How do I merge class sections?
Good morning, Craig Tench 
How do I cross-list a section in a course as an instructor?
How do I de-cross-list a section in a course as an instructor?
I hope this will help, Craig. Please reach out to Community members if you have additional questions about this.
You mean it the other way around;cross-listing is called merging in Canvas.
John, Chris Hofer had it right! Cross-listing is called cross-listing in Canvas. Canvas doesn't use the terms "merge" or "merging" in this context.
Good morning, Craig Tench
Welcome to the Canvas Community. Thanks for posting your question. Merging your course sections is called cross-listing in Canvas. Here are a couple Guides for you to look at:
How do I cross-list a section in a course as an instructor?
How do I de-cross-list a section in a course as an instructor?
I hope this will help, Craig. Please reach out to Community members if you have additional questions about this.