on the confirm page, there is a collection of hidden elements that pass the order information to paypal.
you will need to edit those hidden elements.
you will find 4 of them, that look smilar to this;
<input type="hidden" name="on0_<?php echo $eCart1_Index+1; ?>" id="on0_<?php echo $eCart1_Index+1; ?>" value="" />
<input type="hidden" name="os0_<?php echo $eCart1_Index+1; ?>" id="os0_<?php echo $eCart1_Index+1; ?>" value="" />
<input type="hidden" name="on1_<?php echo $eCart1_Index+1; ?>" id="on1_<?php echo $eCart1_Index+1; ?>" value="" />
<input type="hidden" name="os1_<?php echo $eCart1_Index+1; ?>" id="os1_<?php echo $eCart1_Index+1; ?>" value="" />
the first one:
<input type="hidden" name="on0_<?php echo $eCart1_Index+1; ?>" id="on0_<?php echo $eCart1_Index+1; ?>" value="" />
is for passing the option name:
<input type="hidden" name="on0_<?php echo $eCart1_Index+1; ?>" id="on0_<?php echo $eCart1_Index+1; ?>" value="Style" />
the second one:
<input type="hidden" name="os0_<?php echo $eCart1_Index+1; ?>" id="os0_<?php echo $eCart1_Index+1; ?>" value="" />
for passing the option value, set its value to use the Style cart column binding.
again the 3rd is also for passing an option name, set the value to "Engraving", the forth is to pass the engraving column from the cart.