Integrate size, number of pieces and length selection.

-- url of the page with the problem -- : spitz-teufelsdesign.com
-- HikaShop version -- : 4.7.5
-- Joomla version -- : 4.3.3
-- PHP version -- : 8.1.21
-- Browser(s) name and version -- : Chrome

Hello,

I would like to have the number of products displayed right at the beginning, not just after you click on the shopping cart.

I would also like to add fields to the product where you can select the size or length.
How does this work and how can I implement it?

Many thanks in advance for your help.
Best regards
Manuel