Dietary Supplement label approval process

I'm helping a company get some processes defined and written down.  There seems to be a lot of disconnect from purchasing, design and actual use of labels.  Is there someone who has a process I could use to make sure I'm hitting all of the important marks of the process?  e.g.-who gives labels part numbers? how do you confirm that the received label is the one you ordered?

Thanks!

Purchasing usually attaches part numbers (usually tied to background financial information) and will assign vendors to make them 

I have always created a binder that has an actual approved label on a piece of paper with any other important info (vendor etc)

Then you create an SOP for ship/receive and/or QA to verify labels against the master binder and record how many arrived

The same binder can then be used for pulling labels for use, verify product code against label (binder should reference both) and enter that check on a production record

This should hopefully eliminate errors