FAB 3000 has "many" selection options, so I'll review a few basic ones.
Individual Select (Works well when you only have a few traces to remove or precise selection is required) - Move the mouse over any trace objects and it will become highlighted. Press the Left mouse button and continue for any other traces.
Selection Filter (allows you to group select objects with a filter). Make sure the layer or layer(s) with traces that you wish to remove are visible on the FAB 3000 screen.
Note: You can also save these selection filters so when you use FAB 3000 again in the future, you can select the saved filter state from the "Filter Name" combo. For more detailed information about selection filter please view the FAB 3000 Help Manual.