Filling excel file for retailer - HEBE with my product data - 20 SKUs

Hello, I am looking for someone to help me create a price calculator in excel. Case I have a number of different price lists from contractors, the prices are different, different periods of validity, different discounts. To calculate the price of a service I need data such as date of stay from to, number of people, if a child over a certain age then.... if under, then..., etc. The idea is to be able to select the period and other variables and have excel return the final price.

I will commission the creation of an Excel table from a scandium document. Please note the documents are in German.