Scenario Editor - How do I reset player resources to zero?

I've made an arcade style games where you get 1000 of each resource, build a small army and fight your oponent. When somene runs out of army, all units die and the scenario resets, each player gets 1000 resources again etc.

I am trying to prevent resources from carrying over between rounds- ex if you only spent 500 gold one round, you'd have 1500 gold the next round. if I could zero the player's resources between rounds it would solve the problem.