Hi there, @kvanheuk. I'm here to help you track the project labor cost in QuickBooks Online (QBO).

In QuickBooks Online (QBO), project labors will only reflect on your Profit and Loss report once you've invoiced the time that is billable. This may be the reason you're unable to see some of the labor cost in the report. Same goes with vendor hourly cost, they won't appear in the report unless you created an expense transaction using the hourly service item. 

Additionally, you'll have to make sure that you use the correct report period and accounting method. 

On the other hand, we can also run the Time cost by employee or vendor report. This will show the project's cost rate, cost, billable rate, and total billable amount.

For more information, check out this article: Track hourly labor costs and profitability by project in QuickBooks Online.

I've also include this helpful resource that you can use to have a guide in setting up payroll expenses for projects: Set up payroll expenses in the chart of accounts. 

I'm always here ready to lend a hand if you have any other concerns managing your projects. Have a good one and stay safe.