How to extend entity.

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In my project there having one entity userinfo which contains multiple attribute. and i have created one more entity AdditionalInfo in that having two attribute. and I want to extend both attribute together when i call userinfo enity. Pls suggest solution how to make relationship between this two enity 
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1 answers
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Use one-one association between the two entities and use the association to retrieve or display the additional attributes. Any challenge with that?

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