Add button to change whole product category prices in ticket screen

[Jesse]

This is not exactly what your asking but it covers some techniques you could use. Click link and read the deeper parts of it. Some of it covers using price lists to change prices for specific hours and days. Best part is its automatic no button needed.

Automatic discount based on customer discount-level with set amounts per product

I would like to setup automatic discounting based on customer discount-level (a customer custom field), where each product has fixed discounts depending on this level. For example: The customer entity has a custom field Discount-level, which can be level1, level2 or level3. Each product has three custom tags: level-1-discount level-2-discount level-3-discount This tag contains the exact amount to be discounted from the product price depending on the customer’s discount-level. If the tag i…

Specifically look here:

Automatic discount based on customer discount-level with set amounts per product - #120 by QMcKay