如何使用单输入值进行多输入？

in my code have single input fields

 <input name="downpaymentpc" id="downpaymentpc" class="txt" type="text" size="8" maxlength="8" onChange="javascript:downPaymentPcChanged(true);" value="<?php echo $min_fha_down_payment;?>" />

Now My design have four input Fields how to assign this value four input fields ? please help me