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Hi,
Please refer to the following blogs
Creating a cross site lookup field without code
http://sharepoint.stackexchange.com/questions/79629/cross-site-and-spfieldlookup
http://www.stephanrocks.com/2013/11/26/create-cross-site-lookup-fields-in-sharepoint-2010-utilizing-site-columns/
https://www.youtube.com/watch?v=qroouphu9E4
Please don't forget to mark it as answered, if your problem resolved or helpful.