How can we see the simultaneous(non principal & non scheduled) resource availability in supply plan?

Summary

We use a combination of ((machine1 or machine2 or machine3) & (tool-1 or tool-2) & tool-3) to produce a specific item. Machine can be made a principal resource while others unscheduled simultaneous resources. However, in planning, we can only see the loading & availability of scheduled resources. How can we see the resource availability and load on non-principal simultaneous resources considering the combinations we can have with machines and tools.

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