Confusion about Mirror command use condition

[Anonymous]

Hi,

(Model attached) I'm trying to make the features mirrored to the inner walls of the other two other grooves. There is a partial cut into the wall, and a half-circle protrusion, and finally a fillet around the protrusion. As you can see in the model, I could mirror certain parts with certain type of mirror, for instance the groove on top worked with mirror-face, and the protrusion worked with mirror-feature, but I cannot get an effective way other than trial and error. You can see in timeline I tried numerous different selection and different types (feature/face/body) but few worked.

Also, when I tried to mirror them to the adjacent wall (on the other side of the same quarter-block), it warns me that mirrored parts cannot intersect. So I really don't know which faces/features should I select, and what type of mirroring should I use. 

[davebYYPCU]

There are a few other problems to sort, 

I will presume you want 3 of these items, from a quick assessment of the file, 

Use feature/s selected from the time line.

Use circular pattern count 4 and suppress the unwanted one.

Might help...