You can bookmark textA and then use a REF field to create textB.

The method is decribed here under the heading Bookmark:
http://gregmaxey.mvps.org/Repeating_Data.htm
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Greg Maxey/Word MVP
A Peer in Peer to Peer Support

Melissa S wrote:
If I have text A in one part of my document that will change and text
B in another part of the document that is exactly the same, Can I
make it to where when I change text A, text B is automtically changed
too. I do not want this in a footer or header. This is in the body
of the document.