Oh my goodness, yes
Let's define our terms, though: I don't say "merge." For me it is "creating a composite." In expert mode, do a selection from one photo (such as a single balloon), give the copy command, then switch to your sky (background) and do the paste command.
Your selection is now on its own layer and can be re-sized or moved with the tool for that purpose.
If you repeat the steps with another balloon, when you do paste command, you have another layer with just balloon #2 on it.
If you wanted to stop now, you save as a PSD file. When you re-open to continue work, all your layers are still visible. You can flatten the layers and
save as jpg, but as long as you have the storage space, also keeping a psd is a good plan.
I currently manage UHH's post processing forum. If you'd like to create a topic there and provide a few elements for demo, there are several folks (myself included) who would be happy to help you become more comfortable and familiar. Here we are:
https://www.uglyhedgehog.com/s-116-1.html
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Oh my goodness, yes img src="https://static.uglyh... (