Ok, I'm assuming you're talking about a bound, so heres my explanation.
Simple, you can do it two ways really, the first way is to use a switch for each level's completion (bad), the second is to use a single death counter, and just add 1 death for each level completed. Thus, your trigger to spawn at another objective would be:
| Trigger |
| Conditions: |
¤ Current player has suffered X deaths of level
|
¤ Current player brings exactly 0 men to "level 2"
|
| ¤ Current player's custom score is at least 1 |
| Actions: |
¤ Create 1 bounder at "Level 2 spawn"
|
| ¤ Preserve trigger |
Then also have a trigger that adds 1 death of level every time they complete a level.
The above trigger also doubles as the respawn trigger, hence the conditonn requiring custom score, which I assume you are using for lives.