How to create a single new module based on a few others

[mossfoot]

I am working on a custom setting to play with my friends, using content and rules from a few different modules I have.

But I'd really like to avoid "doubling up" on the modules... for some reason I ended up getting copies of the same entries. I'd really like to just take what I currently have, move it all into a new module, then only use that instead of the mish mash I currently have, including all the descriptions I've added in the meantime.

How would I go about doing that?

[LordEntrails]

Create a Development Campaign.
In the Dev Campaign open the modules you want to copy from
Copy all the entries you want.
Close all the other modules, verify your Dev Campaign has everything you want.
Export to a module
Open the new module in your play campaign.

See link in my signature about adventure modules for detailed advice.