Hi,
I know that I tested a product template with characteristics but I never test a product template with variants and the current HikaMarket algorithm won't manage it ; like the HikaShop product edition interface.
But even if the product edition could manage it ; when you want to create a product, the product is not really created ; you have to save it to store the data in the database.
If the product template have variants, it means that when you want to create a new product, the variants has to be created in the database before their parent ; which is not possible because the parent is not yet created, it does not have any ID, any code (SKU).
So with the product template you can propose a product with pre-set characteristics and the vendor will have to create the variants once the new product is saved.
Otherwise, the creation process should create directly the main product and the variants in the database ; but it will require a product code (which should be unique in the database and not empty)
Regards,