To add a new record, simply navigate to the tab and click the "Add New Service/Repair/Upgrade Record" button and you will be prompted to input the details of the record.
To move existing records between the three tabs, simply click on the dropdown button to the right of the Delete button and select the tab to move the record to.
If you have supplies set up, you can click the "Choose Supplies" link under the Cost field, and a dialog will prompt you to select the supplies and quantity of each supplies you wish to requisition for this record.