Finishing an online store on PHPShop

Latest build
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1. In the admin part add the columns "extra name" and "barcode", and the same fields in the product edit form.
2. After an order is placed, the "extra name" and "barcode" are added to the "name" and "article number" in the e-mail to the admin.
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1. After an order is placed, the "extra name" is added to the "name" and "article number" in the e-mail to the customer.
2. After an order is placed, the "extra name" is added to the "name" and "article number" in the customer's personal account.
3. The "extra name" is added to the "name" and "article number" on the customer's checkout page.
4. Likewise in the customer's printed forms.
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1. The data must be exported and imported via 1C and Excel, and the import and update must be tied to the "barcode".
2. The product price must be hard-coded in the database on import and update, while the price on the site is set in the product storage catalogues.
3. Several sites receive data from one database, and the prices on the sites are set in the catalogues; different sites have different prices.
Shop1 – adidas –50%, pma –60%
Shop2 – adidas –55%, pma –65%
4. An ordinary product must understand zero and positive stock of several subtypes, i.e. if the subtypes are at zero, the ordinary product is "made to order" and must have a product selection form when ordering, as on (Testo nascosto).
5. Subtypes must be visible in the price list on the site and have a working link to themselves.
6. In the admin panel, the toolbar with the buttons OUTPUT, ID, NAME etc. must stay in place when scrolling, plus a filter for the new "extra name" and "article number" buttons.
7. Bring back the option from previous versions of the script: one image for several products.