Multiple text boxes for data entry?

Ok, for a visual understanding, i shall demonstrate the following


Name Stall Number of persons




name, stall & number of persons are 3 different types of data (textboxes) from the person entering it.

scenario: person enters more than 2 entries.

how do i get the number textboxes to grow (+1?) as soon as there is data in the “number of persons” or any other way.
is there any example with source or so that i could look at?

help much appreciated,
thanks.