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HI [USER=137764]@RedDwarf4Ever[/USER]

Here is the simplest way I know

Make the selection with the marching ants.

The use the keyboard shortcut Cmd+J  (Cntl+J on PCs) and that will copy that selection to the Layer above

Use the command  Edit > Transform > Flop Horizontal  (or Flip Vertical if you need that)

Press the keyboard shortcut V (which opens the move tool)

Drag the selected piece (with mouse, trackpad, arrow keys, etc) in the new Layer to where you need the mirrored selection to go.

Hope that gets you going

John Wheeler

For instant tutorials you can google for a Youtube video on the topic or go to helpx.adobe.com which is an online reference manual