Assuming you are referring to how the costs for project management are determined and allocated to a project, this really depends on the companies involved. I've worked in contexts where PM time was budgeted as a percentage over the duration of the project and multiplied by an hourly rate as well as in situations where the PM effort was a flat percentage of the overall estimated cost of the project so it really depends.
In addition to how the costs are allocated overall such as % of the total project costs or labor hours, there are also differences in the actual cost incurred by the PM.
One factor is the burdened labor rate or “wrap rate”. The cost of the PM is not just their own salary, but also the management time to support the PM with performance evaluations, training, computing, paying the electrical bill, etc. That will depend greatly on the size of the business and physical location among other things.
Specific projects may also involve higher cost factors such as a project that requires a lot of travel and drives additional costs to transport, feed, and house the PM. Based on accounting rules, that may be a general fund for all travel or charged against the PM budget directly. Saving Changes...
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