Auto billing; when and how to use it.
Your CSA subscription(s) default SKU is a recurring/single delivery payment. If you intend to bill in this manner, you can leave this default SKU setting. The dollar value amount per delivery is taken from the amounts specified in your share settings.
If you wish to collect payment for the CSA boxes in larger, but still recurring, credit quantities you may edit the recurring billing frequency in your product settings.
Shares & Products / Product Listings / Edit Product:
The member will be billed as follows: price of one box x recurring billing frequency.