Depending on your particular business, your supply chain planning may focus on:

Manufacturing
Logistics
Supplier relationships and so on..

Supply chain is much more than saving costs, ultimately, it's up to you to prioritize which supply chain metrics to use, and what results are you trying to get.

Many companies use supply chain metrics that is easy to calculate but don't help drive improvements. And some companies use a variety of complex metrics that may not be telling them anything useful.

When you're trying to decide which metrics to focus on, just Keep It Simple :)

Ping me if need more info.
'Thanks,