Individual selection of resources when scheduling

Hi everybody!

I would like your opinions on the following scenario. Is it viable to work with it in AX 2012? In which way?

If I have a resource group with 5 resources, my production order is job scheduled to be worked by the 5 resources. When it is about to be started, I decided because whatever reason, that I will only use 3 of the 5 resources.

Where and how can I reflect this decision in AX? So I have 3 resources occupied longer time, and the other two available if no other production is selected for them.

Thanks a lot,