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OmniFocus stores its archive here: ~/Library/Application Support/OmniFocus/Archive.ofocus-archive
So you'll need to move that file to the exact same place on your MacBook Pro.

1) If you don't see the Library folder in your home folder, choose "Go to Folder..." from the Go menu in Finder and paste in
~/Library/Application Support/OmniFocus
and click Go.

2) Copy the 'Archive.ofocus-archive' file from this folder to your MacBook Pro by whatever means is convenient (file share, email, telepathy...)

3) Repeat step 1 on your MacBook Pro.

4) Put the file from step 2 into the folder you just found in step 3.