Reducing the overall size of my mail

I have a few thousand messages in a local mailbox that I would like to remove from my iMac but not lose altogether.
It seems I have two options
1, export the messages from a local mailbox then delete it from the mail app
2, move the mbox file from library/mail
So to my questions
is it OK to do option 2 and if I want to access the message again do I just copy them back in into the right mail folder?
if I export the messages do I have to import them again before I can access them or can I simply open the file from wherever I store it (like I can a .PST file)?
If I have to import the file should it be as an Apple Mail file or as an Mbox file, the latter works, the former does not seem to reimport all my messages properly.
Thank you for your help
Ian
Incidently, I have looked at the Archive option but this does not seem to do anything for me towards my target of reducing my overall mail size.

Based on a quick test I just did, option 2 worked better for me. When I tried option 1, I got the below, but no e-mails and the e-mails stayed in the Mail program.

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