Chamfer direction

Newbie question, is there a way of reversing the direction of a chamfer, I want the chamfer to blend my cylinder here clearly, not cut in the way it is?

I think at first you should union the hole parts with the main, after will work the concave chamfer

Hi @nick-edw Welcome to the Forum.
As @JST suggests, in this case, the separate Bodies will need to be made into one.
Use Tools > Union.
In the end result Select the Line where an ‘old’ join used to be and pull the Double arrow outward:

Yes I now realise I had separate bodies, which was my problem. Thanks for the help.