Where do I find that option, sorry if this is very newbie, I just don't know where to find that option.
I've modified the design since:

However, same problem now I would like to cut a rectangular hole in each sale, from the top to the bottom close to the center shaft to about 50% of the sale, hope that makes sense ?
Thank you, I believe using the information you posted that I've got a solution:
1. Plane at Angle
2. Create Sketch on Plane
3. Extrude rectangle created on sketch through existing body.
4. Repeat process for each sale.
That worked for the first sale, but now I'm having problems replicating for the others, I want to copy the sketch and rotate, but for some reason I am unable to create a copy ?
I know what I want to do, its just frustrating that I don't know how to achieve it. I have a sketch on one sale, I want to copy that same sketch to each of the sales, but I'm not getting the copy option enabled when I use the Move/Copy option.