Hi Ashish Jagani,
BW modelling tool is available only from BW 7.40 SP05 Onwards .
What all you can do in BW modelling tools:
1) Composite provider creation and maintenance
2) Open ODS view creation and maintenance
3)Advanced DSO creation and maintenance
You can invoke the ABAP modelling screen in Eclipse based studio and do other ABAP based modelling.
Hope this answers your question.
Thanks & Regards
A.Dinesh