The easiest method:
Export the stuff from your Yojimbo that you want to import into
another
To do that: Select Yojimbo items you want to export using clicks with
shift key or apple/command key
Go to file menu, select Export
In save dialog box that appears, choose save location (and create new
folder if desired) and click save button
If exporting encrypted items, yojimbo password will be requested
Move folder with exported items to other computer
Drag items into Yojimbo
If you exported a lot of items, do the importing in small chunks, so
yojimbo doesn't choke
-Chris Hart