This should get you started:

http://word.mvps.org/FAQs/TblsFldsFms/LinesInForms.htm

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Greg Maxey/Word MVP
A Peer in Peer to Peer Support

Ray Pendergast wrote:
I am not sure what to call this feature, so I don't know what to read
up on in the Index. I've seen it done before. A form created in
Word is looking for data to be entered into certain fields. Those
fields contain grey blocks of circles. When you hit tab, the cursor
jumps to the next block. The block is replaced, never to come back
again, with whatever you type. What function of Word am I describing?