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You must go to Tools>Options>Mechanical Design>Drafting>Annotation and Dress up and clicking 3D associativity in the section Balloon Creation and select "Part Number" in the list on the right.
Then, go to the CATDrawing and select the icon "Balloon" in the tool bar "Annotations" and select your part.
The only problem is that the texts are with balloon if you don't want text with balloon you must remove them one to one or at the end doing a search of all the texts for memove the balloons at the same time.
OK, it's true but you can select a normal text and clicking in your balloon write the second text, then both of them keep linked and you can move them together.
The bad thing is that the second text can't be inside of the balloon.
I hope you don't need have them inside both of them.
The best thing you can do it's take off the balloons in the first text and link the texts like I said you.
I can't help more, I don't know another method for doing this, I'm sorry and good luck.