In the QuickBooks Online section, click Upgrade your plan.
Review the available plans and then select Choose plan.
Follow the on-screen steps to upgrade your plan.
If you're already using the Plus version, let's ensure that the billable expense feature is turned on. This way, the column for customer job will show.
Here's how:
Go to the Gear icon and select Accounts and Settings.
Choose the Expenses tab.
Click the Bills and Expenses section.
Turn on the Make expenses and items billable option.
Select Save and Done.
Once done, go back to the Bill page to check if the Customer job column shows.