OPs is Operations. Kinda like DevOps for development, they keep the wheels turning.

OPs are usually everything after the GM (General Manager) so the area manager (would have multiple stores), then regional manager (would have several areas) and above.

Operations also include anything that has to deal with getting product into the store like Research & Development, supply chain, or commissary.

Hope this helps.

My guess is operation procedure, a way of working, guidelines to follow.