For each resource (project members and virtual), you can set values 1 and cost 2 when you add them.
It is possible to set the following values:
1 Per item
This value is used to calculate the cost per item of a material resource. It can be the whole sum of a single resource or the cost of a single material unit. In the project grid, you will be able to set the number of items.
Note that in this case, there is no connection between task duration and cost.
2 Per hour
This value is used to calculate the cost per hour of labor resources. In the project grid, after you assign a task to your resource, you will be able to set the number of hours this task requires. The cost will be calculated automatically based on the hours required to complete it (i.e. based on estimation).
3 Fixed cost
This value is used to set the cost without any link to hours and items. In the project grid, you will be able to set the exact cost for each resource. This is basically any lump sum payment that does not entail further calculations.