Problems in Hikashop with variants

-- HikaShop version -- : 3.1.1
-- Joomla version -- : 3.7
-- PHP version -- : 7.1
-- Error-message(debug-mod must be tuned on) -- : Hello,
Hikashop can display When I choose a product to buy I can choose a variant (whole cake, half a cake and a piece, resp 15,-, 8,- or 2,- Euro).Could you please send me the demo for this one?

Thanks so much

Hello
Hikashop can display When I choose a product to buy I can choose a variant (whole cake, half a cake and a piece, resp 15,-, 8,- or 2,- Euro).Could you please send me the demo for this one?

Thanks so much
Iva
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Hi nicolas!
Thanks so much for your quick reply.