Thanks for reaching out to the Community, Prostang. I appreciate your detailed information.

With a Plus subscription, you can track billable time by job by setting up jobs as sub-customers. This enables you to invoice billable time and keep billable expenses organized.

Initially, you'll need to add the job as a sub-customer of your customer you're doing the work for.

Here's how:
 

1. In your left navigation bar, go to Sales, then Customers.
2. Click New customer.
3. Enter all of the appropriate details for your sub-customer.
4. Turn on the Is sub-customer option.
5. From your Enter parent customer ▼ drop-down list, choose a parent customer.
6. Pick Bill with parent.
7. Select Save.

Next, you can turn on and record billable time. Once you've entered billable timesheets, you'll see them available to add to new invoices.

Please feel welcome to send a reply if there's any questions. Have a great Tuesday!