Hello,
You can assign a plan to a HikaShop product and a HikaShop variant.
So if the main product have a plan, every variants will inherit of that plan (and create subscriptions).
But if you do assign plan to variants, only that variant will perform the subscription actions.
Each one can have its own price, duration and type.
Regarding the usage of Paypal recurring, it's related to the kind of relation you set-up between the product (variant) and the plan.
The "Creation then Renewal" is the best one for recurring payment with Paypal recurring.
If you use just "Creation ", you won't have recurring possible.
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.