Making a tree view

Hello
I have a dataset that returns me the following:
word1 :: WORDA :: wordA1: xxxx
word1 :: WORDA :: wordA2 :: wordA2.1
word1 :: WORDA :: wordA2 :: wordA2.2
word1 :: WORDA :: wordA3 :: wordA3.1
word1 :: wordB :: wordB1: xxxx

and I want to appear in the report numbered as follows:
1.wordA
     1.1 wordA1
      1.2 wordA2
           1.2.1 wordA2.1
            1.2.2 wordA2.2
      1.3 wordB1
Do you you think of something? Can it be done?
thanks