Dynamic mirror tool in SOLIDWORKS
A cool tool called Dynamic mirror which you maybe did not know about.
What is Dynamic Mirror? It is basically like a regular sketch mirror with one major difference.
I have started a new sketch and what I did is that i drew a centerline without any other 2D geometry.
So if you want to find Dynamic Mirror it is in Tools--->Sketch Tools--->Dynamic Mirror.
After I activated the command I need to select a line to mirror about.
After I selected the line I just began drawing on one side and what happens is that everything replicates on the other side as I draw, you have got these "equal" icons near the vertices.Try this and you will see clearly.
And this is some shape I randomly drew, the command is not a big deal, you will probably still use regular mirror, but still, a nice tool :)