Djoc
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Unless things have changed recently, that feature is on Paizo's (more exactly Gary's) to do list. I have no idea what order of priority, though.
Until then, you'll have to place a separate order.
(As a side note, but I'm on ground I don't know much of and which implies a lot of variables I'm not completely familiar with, so don't quote me on that : The products you mention are not books/bound printed mater, and therefore, joining the orders might not necessarily make the overall shipping charge being lower, as opposed to shiping them separately.)