How can the contents of a list be grouped together?

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The contents of a list can be grouped together by defining sub-lists within the main list. This can be done by using indentation or bullet points to visually indicate a hierarchy or subset of items. For example:

Main list: 1. Topic A 2. Topic B - Subtopic 1 - Subtopic 2 3. Topic C - Subtopic 3 - Subtopic 4

In this example, Topics B and C each have subtopics that are grouped under them. The use of bullet points indicates that these items are subsets of the main topics. Another way to group items in a list is to use headings or titles to clearly define different sections or categories.