How do I not save certain types of data?

I want to make a small game with the gimick of abusing the save/load system go beat levels. However,I don't know how to make the System->save/load blocks not save certain types of data (such as enemies or player's powerups ). Is there a way I could do this with the simple System Save/Load blocks,or do I have to use something extremely complicated like json loading?

Objects can have a no save behavior added, so you can use a helper object with that behavior to keep track of powerups.

Alternatively, you can use an event with the on load complete condition to reset any particular variables you want.

Thanks for the help :D