custom fields that only show on variants

-- HikaShop version -- : 2.2.3
-- Joomla version -- :3.2.1


I have kind of a weird request and i cannot find a solutions to this. I have a mattress site i am making and I am almost done with it so this is urgent. I have characteristics that describe the mattress. I then have product variants of that mattress: twin, twin xl, queen etc.

I basically have 3 custom fields that I only want to show up under the variants not the main product.

Also, under the variants how can I hide all the custom fields on the main product they automatically show up on the variants and they do not need to be there.


Also if you can think of a solution to where I can make a custom field show based off of the product characteristic dropdown selection. This is what I have been trying to figure out because it seems like the easier way to go about this? I already have the 3 fields i need for each characteristic in my main product. I know this requires some javascript, but I do not quite know how to write it or where to place it at?How would I go about doing this way?
Thanks,

Josh