XTREE enhancement: add the ability to limit the Auto-Sum feature, introduced in 6.5.1631.0, to specific levels in a multi-level tree. As with the regular Auto-Sum feature, it is activated by inserting one of the following tokens into the header, or more typically, the footer part of the header:

=SUM                            ! standard auto-sum

=SUMLVL(#)                      ! auto-sum just level #

=SUMLVL(#,#,...#)               ! auto-sum the specified levels

The last level in the parenthesized list may have a "+" appended to it, e.g. =SUMLVL(#,#+) indicating all of the levels from the specified one down. So for example, =SUM(0,2+) would include all levels except level 1.

This example includes levels 0, 1 and 2 in the Auto-Sum:

coldef += "20~10~Qty::=SUM(0,1,2)~#E~~