86 machines as a single work center

Dear PP Experts,

I have a following issue

My client has 86 machines installed in a plant. For example, if i make a single work center against 86 machines how i would plan that my production has been done on how many machines ?

Physically a production lot load is divided on 5 - 6 machines.

I want to keep track record on HOW many machines and WHICH machines were used in production? For example machine # 21, 28,55,77 & 82 !!!

How can i get it using a single work center for 86 machines ( As per my knowledge, Group of machines can also be treated as a single work center)

Please Reply ASAP

Best Regards

Ahmed