Hi,
There are two possible ways.
The easy way is to use a SEF extension like 4SEF. With it, you can set the URL you want for each product, regardless of the structure of your menu items and how Joomla's SEF system works.
The more difficult way is to :
- create a menu item "category" of the type HikaShop categories listing
- create a menu item "accessories" of the type HikaShop categories and linked to your category "accessories" with the menu item above as parent.
- create a menu item "bracelets" of the type HikaShop categories and linked to your category "bracelets" with the menu item above as parent.
- empty the "product SEF name" setting of your HikaShop configuration page.