[RESOLVED] How do I combine similar items into one item a treeview?

[MikeFowler]

Right now I have the situation in which my treeview looks like:

Plan Heading
. Plan Item 1
. Plan Item 2
Plan Heading
. Plan Item 3
. Plan Item 4

and I would like to use code to combine the two Plan headings into one:

Plan Heading
.Plan Item 1
.Plan Item 2
.Plan Item 3
.Plan Item 4

What code is appropriate?
Thanks!
Mike Fowler