I found another post which indicated the direction I should go. I am still having an issue. Here's what I did:
1) Created ProductA
2) Created CharacteristicA with options "One" and "Two"
3) Created CharacteristicB with options "Red", "Blue", "Green", "Yellow"
4) Added CharacteristicA and CharacteristicB to ProductA
5) Clicked on "Manage Variants" for ProductA
6) Removed some Variants, leaving the following matched:
One - Red
One - Blue
Two - Red
Two - Blue
Two - Green
Two - Yellow
7) Saved ProductA
On the front-end, when I open ProductA I see two drop downs, one for CharacteristicA and one for CharacteristicB. If I select "One" in CharacteristicA I am still presented with all choices for CharacteristicB. I thought all I would get in CharacteristicB is "Red" and "Blue", so I am confused.
Thanks!!
Rick