So if I got this right, you got multiple layers that form a shape... and what you want is to make a selection of all of them put together?
I might be way off, but assuming the goal is a combined selection, here's two methods:
So normally you Ctrl + Left click
the thumbnail to make a selection of from a layer. But you can use Shift + Ctrl + Left click
to add to the selection. That's what I do in the following gif
List of all the shortcuts relating to this:
Ctrl + Left click
- Make a selection
Ctrl + Shift + Left click
- Add to selection
Ctrl + Alt + Left click
- Subtract selection
Ctrl + Shift + Alt + Left click
- Intersect selection

Or if you have multiple layers, it might be asking too much to Ctrl + Shift + Left click
all of them... So you could do this:
- Select (activate) all the needed layers:
Left click
on the first layer and Shift + Left click
on the last layer
- If you have any layers you want to exclude, or you just want to pick layers from here and there, use
Ctrl + Left click
.
- Duplicate
Ctrl + J
- Clear layer styles if needed:
Right click
on any of the activated layers and Clear layer style
- This is needed only if any of the layers have layer styles that add to the layer size (like "Drop shadow") and you don't want to include it in the selection
- Merge
Ctrl + E
- And now you can make a selection from the new layer's thumbnail by using
Ctrl + Left click
.

So I'm not entirely sure if selection the selection was just a means to an end in your mind, given that you talk about cloning the shapes... but I did also cover the duplication and merging as a way to get the selection, so maybe this answers the question. If you want the combined shape to be single color, you could recolor the merged shape or make a new layer and fill that with a color.
Convert all Ctrl
modifier keys to Cmd
if you're using Mac.