how to add a Variant to a datatable?

i create a datatable,one of its variable’s pin type is “Variant”. how i add asset to this datatable?
the picture add is:
http://tiebapic.baidu.com/forum/w%3D580/sign=004083862d87e9504217f3642039531b/28f8b4d12f2eb9382d10f6b7c2628535e5dd6f12.jpg
http://tiebapic.baidu.com/forum/w%3D580/sign=d7ad841842fbb2fb342b581a7f4b2043/69d1b4d3d539b600b4b083f2fe50352ac65cb71d.jpg