Help with a different taxonomy view and select

Hello again,

Now I have a different problem.

I have an hierarchy in my taxonomy terms.

Vocabulary: Product main category

Terms:

A
--A1
--A2
--A3

B
--B1
--B2
--B3

I want to give the user 2 dropdown lists when they capture a product.

Dropdown one will show:
A
B

Dropdown two will show:
If A selected:
A1
A2
A3

if B selected
B1
B2
B3

I couldn't find a module that can help me with that.

hierarchy select needs a module, that is in development for Drupal 5, and I installed it anyway, but couldn't figure out how to use it.

The other problem I have is that I need a view that gets the parent term as an argument, and displays the child terms as groups.

for example, for parent term A the view should look like this:

A

A1
product one
product two
product three

A2
product four
product five

A3
product six

Please, can someone help me with that?

A note:
In the Drupal meeting, a few people told me that everything can be done with Drupal. That if I don't know how to do something, I should ask for help, or find someone that does know how to do what I need.
So can someone please step up and help me here?

I'm on the edge of losing all my hair here.... not good, I love my hair :)

Thanks,

Sigal