quick question Ipad Transfer

How can I transfer video files on my pc via Itunes to an Ipad that isn't synched with my Itunes, while i have another Ipad that is synched to it. When I try to transfer a file, Itunes wants to erase everything on the new Ipad. Can I manually manage what gets synched to the new Ipad without erasing everything on it??
I am trying to put some videos on my daughters Ipad so her son can watch them on the plane trip back to NY.
Need a solution asap


Thanks

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