Hello,
While there is an interface in the backend to see the list of serials and refresh the serial assignation ; there is no similar interface for the subscriptions.
I have to admit that I didn't think that would be needed since you can create manually subscriptions in the backend and there is no need to assign them to orders (even if you create the order in the backend, there is no recurring).
So I will add in the TODO list to add a similar interface and a way to perform a "refresh subscription association" when you modify (or create) manually an order in the backend.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.