Merging MTA files together

How can I merge a bunch of MTA files together into a new one? I can only think of using a text editor to copy + paste them all one after the other, but is there anything I need to consider?

Using the editor is the only way. But you have to renumberi the actions.

I thought as much. But then I was wondering how the Actions menu sorts the MTA files, and if a new one would even be recognised. But then I solved that problem as well.