January has been rummaging around Solstheim and her inventory has gotten packed full of elder scrolls and black books. These of course cannot be removed, ever. (well, you can sell the elder scrolls to the librarian at the Mages College, but January has not joined them yet). I looked for ways to remove them, but there are not really any, aside from a few house mods that have displays built in specifically for them. Since I don't want to use any of those, I came up with the following method. It will work on any item.
Use the Help console command or UESP Wiki or Creation Kit to get the ID of the item in question.
Now remove it from your inventory with the following command:
player.removeitem <ID> 1 (the final number is the number of items you want to remove)
This will delete the item from your inventory.
Then click on the container you want to store the item in to select it. Then open up the console again, and press the Up Arrow once to bring up your last command. You don't have to do it this way, but it is the most convenient.
Change it to:
additem <ID> 1
This will spawn the same item in the selected container.