Text in overflow in one text box can automatically be sent to another text box by creating a
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group
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placeholder

placeholder

Explanation:

A placeholder is a string of characters or word that takes the place of a data. it temporarily represents a data in a position before the final data is inputted into its position  

once the Text in overflows in a particular text box the overflow is taken/sent to another text box where it is temporarily held until the final data is computed into the text box. creating of placeholder is very importing when creating a worksheet and probably other form of documents so that overflows can be directed to other text box making your typing seamless before final computation is now done on the typed data.  

i do not get the question.