Add draft order to existing order

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My head is spinning, I could really use some help, please!


I sell plants. We only ship in spring and fall. In the months leading up to "shipping season", my customers place multiple orders, incurring way more in shipping than is actually required. I cannot refund the excess shipping charges until we ship, which is sometimes months away. Is there a way my customers can have a single order that they can just add to? Also, I send alot of draft orders- is there a way that a draft order can be added to their "running tab"?

Thank you!