Hi,
When an order is made, HikaMarket will create "sub orders" for the vendors (if there are vendor products into).
The orders made before the HikaMarket installation aren't seen as vendor sales (no vendors, no fees, no assignation), there is no sub order for them so they are classical orders for your store.
But, you can edit orders in the HikaShop backend and thanks to it. You can add new products.
We introduce in latest HikaMarket build the possibility to assign a vendor while adding a product in an order.
It is also possible to change the vendor of a product in an existing order but all cases are not supported yet (in the next version some improvements has been made).
So, you can create the sub orders by editing the old orders and re-add the products with the vendor assigned.
The new item will be assigned to a vendor so you could remove the previous item which was not.
Regards,