You cannot merge content controls - you'd have to move the content from one to the other, then delete the one you move the content from. The approach you'd take for this depends in part on whether the content controls have the same title, or different titles.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

macropod, gmayor, thank you, I meant the same title.
As an example, two situations I am talking about:
1. Both CCs have title "A" and the same content "Apple". In this case the macro should delete one of the CCs.
2. Both CCs have title "A" but the content of one of the two is "Apple" while of the second is "Orange". In this case the both contents are merged as "Apple, Orange" and moved to one of the CCs, the second is deleted.
Is it possible?