You can physically make them one object by:
utilities > collapse > collapse mesh : single object
Or it may be better to place a null object in the middle of them and then use your SELECT & LINK tool (1st icon on default main toolbar) and connect them both to the null. Then rotate/attach the null.
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David Chappell
Freelance Motion Graphics / 3D
http://www.IncidentalTrees.co.uk
http://www.WhichDimension.com