I'm the general manager of a restaurant in a franchise and I've held this position for about 6 months. The company hired me from outside the corporation so I'm still learning about the business.
As the general manager, I'm completely responsible for the restaurant, but I rely on my assistant manager and team leads to handle things while I'm not there.
The problem is that my assistant manager isn't a very good employee, in my opinion. I've tried to appeal to him that we're part of a team. He doesn't seem to care about the job and I have no idea why he was promoted to assistant manager. It's past the point of not trusting him to do anything on his own. Recently, I stayed very late in the restaurant counting inventory. I count it instead of him because several times he has messed up the count. Well after counting it twice I couldn't understand why it was off the expected amount. This is a big problem because it looks like we're not making the expected profit and I would need to explain to upper management what happened. Two days later I found out that the assistant manager let another store borrow food, but never took note of it or told me.
Another thing that recently happened was he didn't have a large catering order ready for a customer. She had to wait 20 minutes and even then he forgot to give her the proper food...twice! The night before I specifically asked him if he wanted me to come in early to help him, but he said he had it under control.
I've tried to work with him and I've given him warnings. My district manager has been briefed about his behavior and performance, but she continues to tell me to just work with him to improve. My district manager also kinda puts the blame on me when things go wrong, even though most of the time the reason is him. If I mess up I take full responsibility for it, but a lot of the issues arise due to my AM. When something happens, my district manager wants to know "how I'll improve it in the future". However, my hands are tied from firing the person that is causing issues.
I'd love to tell the district manager that I'll give more oversight to catering orders, but I'm so overworked as it is. I need a team of good people that I can delegate to.
My Question: How can I convince my district manager to let me fire my assistant manager? She wants improvement and this seems like my only option going forward to improve the store.