How can I have price rules AUTOMATICALLY apply for subitems when I add a new item into inventory?

Greetings, @robert50.

QuickBooks automatically changes the prices of items on sales forms according to rules you create. Each price rule can contain multiple conditions that have to be met before QuickBooks changes the sales price.

Here's how to create Price Rules in QuickBooks Desktop:

1. Go to List.
2. Select Price Rule List.
3. Click the Price Rule button and click New.
4. Fill in the necessary information.You can add Customer Name and Item Name that you want to apply the rules for.
5. Click Ok to save changes.

You can check out this article to learn more about Price Rules in QuickBooks: Use Advanced Pricing.

If there's anything else that I can help you with, please let me know in the comment section down below. I'm always around ready to lend a helping hand.