Reformatting a tree structure

I have the categories of a website structured in my database like this:

HOME|Electronics|Printers
HOME|Electronics|Fax Machines
HOME|Electronics|Scanners
HOME|Outdoor|Tents
HOME|Outdoor|Hiking
HOME|Outdoor|Biking
HOME|Outdoor|Athletic

Now I want to connect it to a software that maps to treeview, the problem is that it expects the table to be structured in this way:

1	HOME
2	Electronics
3	Printers
4	Fax Machines
5	Scanners
6	Outdoor
7	Hiking
8	Biking
9	Athletic

Is it possible to convert from one to the other in SQL? Keeping in mind that main categories (like Electronics) will repeat & I want to make sure that they all get the same index.

I can also do it in another language, but it just seems like it could/should be capable in SQL only.

If you want to keep in the same order you could choose numeric values. Like
2.00 Electronics
2.01 Electronics1

This will maintain in the same sequence of all values