How can isolate numbers in a table related with another table?

[Federico_Ades]

Hello Community!

My name is Federico.
I have this issue:

I am using Airtable as the Sales CRM of my company.
I have 2 tables:

• Products
• Sales Orders

I have the link from sales orders to Products so i can calculate to all the Sales Orders the price of that order. I am facing the problem that i live in Argentina and now we have to change prices like 1 time a month and all the previous Sales Order within this link with the products update the value of that Sales Order.

How can I isolate that price so when i change the product price, that sales order price is not modified?

I will be waiting for help!

Thank you!