open edit page of some product in abantecart control panel(menu catalog->products->edit icon), go to tab options and add new option, for ex. "scent" with type "selectbox". Save. After saving you can add option's values (green plus sign). For ex "orchidea", "cactus" etc ... also you can set price for this each scent and save picture for each option values(click 'expand'). Customer will see it when changing values in selectbox on storefront product page.
Fyi. You can save option globally, tha same option for few products. You needs to save global attribute in menu catalog->global attributes and then use it as pattern for products on "options" tab's page.
