Index - sort so that 102 comes after 1 and before 2 in index

[aggiebryan]

I am trying to get an index updated in one of my documents. I was able to mark the sections to get them added with no problem. I am putting together a document with law codes and would like it to reference directly to the section number. Problem is that the header for the section is 1, 2, or any single digit. the codes are listed as 1.100, 1.104, 1.104, 101.100, 101.102, 101.103. I would like to have the sections split up as 1, 101, 102, etc.



How do I get this to happen.

image of what I'm talking about is here.
Familylawcodeindex — ImgBB

[Edit: the following explanation was posted below on 11/19. For answers, see posts that follow that information.

I would like it to be organized like this:


1

1.101........4,10,20
1.102...........11,21

101

101.100........34,90
101.101.............35

102

102.100.........100

Currently it just does it like this

1
1.101.............4,10,20
1.102................11,21
101.100.............34,90
101.101.................35
102.100...............100

2
2.100.....................30

End of Edit]