The Level property returns the indentation level of the group header within the table view. Read-only.
objGroupHdr.Level
Long
The Level property represents the nesting depth of this group header within the table view. The top-level group is at level 1, the outermost level. The maximum permitted grouping depth is 4.
The number of categories, or levels of grouping, in a particular table view is given by the Categories property of the CDO Rendering TableView object.
The Level property corresponds to the MAPI property PR_DEPTH, incremented by a value of 1.