When you’re a consultant, you log billable hours. No big secret there. But you probably also log non-billable hours for internal or administrative non-project work. After all, you want to keep track of all your time, not just the client billable hours.
Each time log in ST has a checkbox for “Billable.” That let’s you select between client work, and internal work. Actually… you might perform non-billable work for a client, so this checkbox doesn’t clearly designate non-client work.
To clearly differentiate between client and non-client work, you should create a “client” for your own company. Any time you log internal hours, consider using your own company for that time. Set up internal admin projects that are assign to your own company. Create non-billable tasks for those admin projects. When you log time to those tasks (under those admin projects) you’ll be logging time to your company. The “Billable” checkbox will be unchecked, plus the client will be your own company. That fully resolves the internal-verses-external client question. It also means that client invoices will never contain your internal time and expenses.