Blueprints
anet agrees … but if you searched before you posted you would have found it it is not technically possible to do so right now and it is not high on the list of things to get around to working on.
Use the workaround they provided. Get a guildmate to help you out, log your toon with the prints you want to move and drop them, note i said drop not deploy, then alt and have your guildmate do the same back to you.
AR
By dropping, it is meant that you double-click the blueprint in your bag, and then press the default package drop button (weapon swap) button of tilde ~ to drop it on the ground.