Hello there, @sma1721. I'm here to share some insights about creating overhead charge for projects in QuickBooks Online (QBO). 

In QBO, overhead costs and operating expenses have to be tracked separately. You'll come up with the total calculating overhead costs by adding them all, breaking them down by month, and dividing the total by monthly sales. Refer to this formula: (Overhead ÷ monthly sales) x 100 = overhead percentage. 

For additional reference, check out this article: How to calculate and track overhead costs for your small business. 

To further assist you in managing overhead for projects in QBO, I highly recommend reaching out to your accountant. They can advise and provide steps on how you can handle the entry. This is also helpful to make sure that they are allocated to the correct accounts in your company. If you're not affiliated with one, you can use our Find an Accountant tool to look for one near your area. 

Furthermore, job costing depends on your business plan and customers. You can read this link for more details: What Are Pay Rates, Cost Rates, And Billable Rate.

I'm always here ready to help if you have any other concerns managing your projects in QuickBooks. Have a good day ahead and stay safe.