First map, photoshop,How to copy and paste multiple items into the same layer

[Midgardsormr]

Assuming that the red circle isn't part of the symbol you're wanting to duplicate, why not make a brush out of it?

Activate the Marquee Select tool (M), drag a selection box around the symbol, Edit > Define Brush Preset… and give it a name. Your new brush will appear at the end of the brushes list.

Now you can use it like a stamp, and every click will place the new instance on the same layer.

[DevinNight]

If you use the clone stamp tool, you can clone that area any number of times on the same layer. Use a brush that is just big enough to get the whole image.
It's like cut and paste without the cutting and pasting.