Dependent Option Sets(through Javascripts) not working in Editable Grids (Inline Editing) from Opportunity View

In opportunity view we are using "Editable Grids" such that selecting a particular "Product Line" field(Option Set) will yield a different set of results in another field called "Sales Cycle".
Here is an example of the mapping:

Product Line   Sales Cycle

Advisory                                                  1. N/A
                                                               2. Case Open/Case Sent

Annuites                                                 1. Discovery
                                                                2. Management

Brokerage                                               1. Implementation
                                                                2. Quoting

So, an user can select any of the "Product Line" value to yield the "different" option set values. Now, the issue is that this is not filtering. So no matter what you are selecting as the Product line, it is pulling in the whole set of results instead of filtering by the option set value or the "Product Line" Value. So it is pulling in sometime like this for Sales Cycle: 

                                                               1. N/A
                                                               2. Case Open/Case Sent
                                                               1. Discovery
                                                                2. Management
                                                               1. Implementation
                                                                2. Quoting

I know we had implemented javascript to do this but currently this is not working. Furthermore, I am not even able to throw an alert in the subgrid form in the view. 

I would appreciate anyone's assistance regarding this.

Thanks!
Cathy.