About Currency for microtransaction between Main and Sub account.

Hi there,

Currently I played on a sub-account, but my coin is still in the main account that I don't play. Can we move to my sub account? or I just buy from the Main account (like stash or cosmetics) and it will cover my entire account (Main+Sub)?

Oh, and one thing about if I want to "upgrade a supporter pack" in my sub account, the price is higher than my main account. Can I just need to buy on main account and I will get items for my entire account?

I already contacted support. But now Stash are on sale and it will take me to a long respond. So I want to know if I buy stash on Main acc my sub acc with get it too?