OPM Finished good with Dual UOM

Hi,

We are making Cables using OPM, problem is that we sale same cable in different length in coils.

For instance,

1) 10 coils of 150 mtr Cable per Coil to one customer.

2)  50 coils of 200 mtr Cable per coil to another customer.

This is same product but as per specification from customer we deliver it. How can i mange & record both UOM mtr & coil.

It will be difficult to create separate item for each combination. there will be many combinations.

Kindly help, what is the proper method to deal with such kind of situation.

Thanks

Ahsan