SC2Mapster

I have multiple "Pickup - Large Scrap Salvage (200 Minerals, 100 Gas)" placed through out the map. There is one 'large scrap salvage' in particular that is placed at a location. When the player picks up that particular 'large scrap salvage,' I want it to issue a "wait" action and then the 'large scrap salvage' appears again at the same location. I do not want a 'large scrap salvage' to spawn unless the previous one has been picked up. I can not figure this one out. Any ideas?

Rather easy...
Have a unit type variable that is pointing at the first scrap salvage at the initialization.
And of course your ability may be different (check which one is used to auto-collect).

The trigger now:

Pickup
    Events
        Unit - Any Unit uses  Collect at Generic6 - Complete stage (Ignore shared abilities)
    Local Variables
    Conditions
        (Triggering unit) == scrapUnit
    Actions
        General - Wait 60.0 Game Time seconds
        Unit - Create 1 Scrap Salvage - 1x1 for player 0 at Start Location 001 using default facing (Ignore Placement)
        Variable - Set scrapUnit = (Last created unit)

Regards