Create a Spot Drill operation to chamfer the holes.
Manufacture > Milling > Drilling > Drill 
Spot Drilling and Drilling are both hole machining operations. There are many hole machining cycles in Fusion. They are mostly derivatives of these 2 basic cycles. Our part has a chamfer on the top of the hole. We'll be creating that chamfer during the Spot Drilling process with a 90° spot drill. Fusion will determine the diameter of the chamfer, from the information on the model.
On the Geometry Tab we can select the locations to spot drill. For this video we'll be selecting by Hole Face. Or in this case the Hole Chamfer Face. But first I want you to check the box that says Select Same Diameter. This tells Fusion to scan the model for any features that match the characteristics of your selection. You should also check Optimize Order. This will sort the holes in the most efficient machining path. Now you can select the face of any chamfer at the top of the hole.
