How to set up up a lap event in your Black Box Timing software: Set up lap race
How to set up up a relay/team race in your Black Box Timing software: Set up relay
You can create lap races based on time or number of laps.
Example of lap race based on time
Example of lap race based on number of laps. Can both be individual and team. Often used for relays.
How you want laps shown on the results list can be specified by going to Event setup and Settings and scroll down to the results list and Lap view mode.