Merging multiple personal made "mods" from separate campaigns

[Ozsome]

I was an idiot and had 3 campaigns running. I designed each campaign within that campaign itself until I saw here the value of creating a development campaign.

My question is, can I export all custom magic items and custom spells from each of the campaigns each into their own mod AND THEN somehow "extract" them so I can build and export one magic mod that I can use in each campaign from one source?

It seems like it should be simple, but I am not seeing a way to extract them.
I can see both mods, load them and see the list of items.

[Zacchaeus]

You’ll need to export your items from each campaign into separate modules. Then create a new campaign and open each module in turn and copy all the items into the campaign. Then export from that campaign into yet another module.

[Ozsome]

Thank you sir. I guess I was looking for a one click way and I didn't even think of what should have been obvious. I just dragged them all over individually and I now have 1 repository now.
Thank you again Zacchaeus for taking the time to answer our questions.