In the Electronics workspace, on the 2D PCB document Design toolbar, click Place > Plated Hole (PTH)
to add a plated through hole.
In the PTH dialog, select the required pad shape.

Specify the hole or slot dimensions.
Define the pad dimensions:
Configure solder mask:
Move the cursor to the required location and click to place the PTH.
When the 2D PCB is synchronized with the 3D PCB, Fusion generates the corresponding plated hole or slot and copper pad geometry.