if box is checked then use one field if not then another (how to?)

[chang]

how can i do it that lets say i have someone shipping address already
inputed, and it is displayd in one field, but if temprarily i want it to
use a different one (for this particular order) i can click a check box "ue
different" and then i can enter a diffent one? thank you

 

[Reggie]

Chang, why not use a combobox based on your shippingto table and bind it to
your shipto field of you table. now the user can select who to ship it to
at will.