Hi Larry,
We have some similar setup issues that we have run into although I have not used a Kit as you have outlined.
In the way we have it setup to accomlish what you want, we would have the item A6 setup in inventory and have the base UOM set to be what you call an A1. Then on the UOM schedule you have 6 A1 = 1 A6.
So, for example if you sold your A6 by the Box it could be 6 A1 = 1 Box.
This way the user can always pick the A6 item code but select to sell a full Box or an "A1" which could be called an each or something similar based on your terminology.
I have not found a good way to achieve what you want unless you setup your UOM schedule to have its base start at the most granular level that you want for the item in question. Going the other way always seems to cause problems.
I hope this helps,
Adam