Generally speaking, according to the contract, first report to the owner that the project manager needs to be replaced, followed by a series of supporting documents to replace the project manager. The certification documents include: the work experience, professional title, education background, safety certificate and builder's practice certificate of the replacement project manager. The qualification of the replacement person is equal to or higher than that of the project manager in the bidding, but not lower than that of the original personnel. For example, the original title is an engineer, but after the change, he can only be an engineer or a senior engineer, not an assistant; He used to be a first-class builder, so he can't be changed to a second-class builder.
This is basically what I got when I was working on the project. You can look at the contract first and see what the requirements are. If some projects are changed, there will be a fine, and then negotiate with the relevant personnel of the owner. Some items are not allowed to be changed, so you have to communicate well. The above is for reference only, hehe.