If you select a (nodal) force from the list of boundary conditions, you will also be able to supply tabular data for P in x,y and z.
You can also apply direct FE type boundary conditions to create spatically varying nodal forces (for Static and Transient analyses only), by clikcing on the Environment Context tab, then click on > Nodal Force. As a scoping method you will have to use a Named Selection, as shown below
Subsequently, you will be able to enter a magnitude for the x, y and z component to define the load, e.g. like
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