Enter the number of previous levels to include in the numbering style. For example, if you enter &quot; 2 &quot; and the previous level uses the &quot; A, B, C... &quot; numbering style, the numbering scheme for the current level becomes: &quot; A.1 &quot; .
输入要在编号样式中包括的上一级别编号。例如，上一级使用“A、B、C...”的编号样式，如果您输入 &quot; 2 &quot; ，则当前层级的编号就是 &quot; A.1 &quot; 。