Just read the Community Guidelines (to earn the achievement) and it mentions when branching off the current topic to “Reply as a Linked Topic”, but I can’t found how to do that in the UI. Am I missing something?
Hey there! Good question, and the solution is a bit tucked away. If you click on the 
icon on the topic you want to link to, and then click “New Topic” it will reply as a linked topic.
Definitely a UI issue, but that’s the how to!
Here’s deeper instructions if needed: How to: Reply as a new linked topic (with optional quoting) - Site Feedback - SE23 Forum
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