Updating the site on OpenCart

We need a website specialist on OpenCart to finalize the site. When selling in packages (the MPN product field is filled with the default quantity in the package). The customer shows the price not only for the packaging, but also dynamically recalculated and shown per piece. (For example: 2400 rubles per op. 12 pcs. (200 p/p.) The module "live price" is purchased, but it must be modified under the theme and task. In addition, if a special price is set for the goods, and if it is lower than the price with a discount for the quantity, the block of prices for the quantity should be shown only in part of the more favorable price. It also needs to calculate and indicate the price of the unit. When choosing another type of packaging in the properties of the goods (for example, there was a package of 12 pieces, a package of 6 pieces was chosen), then accordingly recalculate all prices in all lines. In addition, it was noted that if the price with a discount for the quantity is better than the special price in the price tag, the special price is still shown, and the price with a discount for the quantity is crossed out (this is incorrect in fact (for example, crossed out 1000, and then the special price is shown 1200), respectively, when adding to the basket, the product with a special price is added, and not with a discount for the quantity.