If you are preparing the Activity Schedule, it can have whatever you want in it. The practical question is, 'can you clearly identify when it has been completed?' so you get paid for it.
In the case of itemised preliminary and management costs, the answer is 'Yes', although as a tip I would suggest you put in minimal requirements that you know will be on-Site, even if the sums attached to the individual monthly activity is more in line with what you expect to have within the Working Areas.
Overheads, profits, risks and contingencies are much more difficult to assess, so the normal and sensible practice is to spread them across other activities.
In the case of itemised preliminary and management costs, the answer is 'Yes', although as a tip I would suggest you put in minimal requirements that you know will be on-Site, even if the sums attached to the individual monthly activity is more in line with what you expect to have within the Working Areas.
Overheads, profits, risks and contingencies are much more difficult to assess, so the normal and sensible practice is to spread them across other activities.