Yes, you can mark up the items by 30%, @nwlacontractors-.

By utilizing the Price Rules feature, you can add a new mark-up amount for that specific material. Just make sure to activate this feature from your Account and Settings. This is the hottest feature we offer in QuickBooks Online.

Let me show you how:

1. Go to Settings ⚙ and select Account and Settings or Company Settings.
2. Select the Sales tab.
3. In the Products and services section, select Edit ✏️.
4. Select the Turn on price rules Beta.
5. Select Save and then Done.
   
   
   

Once done, we can create a rule and pick the materials individually. You can follow these steps below:

1. Go to Settings ⚙️ and then select All Lists.
2. Choose Price Rules.
3. Click Create a rule or New price rule.
4. Enter a name like 30%. Then follow this set up:
   *Customer: All customers
   *Products and services: Select individually
   *Price adjustment method: Percentage
   *Percentage: Increased, 30%
   *Rounding: No rounding
5. Hit Apply rule.
6. Select +Add product or service and then choose a specific material.
7. (Optional) Click +Add product or service to add another products.
8. Hit Save and close. I added a screenshot for visual reference:
   
   

Well done! Feel free to read this article for more details and frequently asked questions about using price rules: Set price rules in QuickBooks Online.

Furthermore, you can group your materials into different categories or services. In this instance, you won't have to select them individually in the future when setting up a new price rule. This will help you apply the rules quickly. Simply create a category from your lists and then edit your materials or services to add a category.

In addition, once you've created a lot of price rule for that specific item, you can choose what amount you can apply. I'm adding another screenshot so you can check this detail:

Should you have other concerns with entering a mark up price, let me know. I'm always around to help you more. More power to your business!