There is a tutorial. It first first came out in B4J, but is equally valid for B4A.
https://www.b4x.com/android/forum/threads/b4x-code-snippets.152450/
The snippet you want to copy using IntelliSense needs to be in a separate Snippet Folder in B4X Subfolder of Additional Libraries
additionalLibs>B4X>Snippets>aSnippet.txt
Each snippet is a text file. Take a look at the examples.
You have to make your own collection of snippets, based on your own favorite codes or the numerous examples on this forum.
If you change or add a snippet while inside the IDE, make sure to refresh (right click) in the Libraries Manager panel.