Hi,
There is no option for that, but we have something in place to do it easily by editing the file "custom_fields" of the view "checkout" via the menu Display>Views and changing the code:
$showfields = array(
'my_special_field1' => 0,
);
There, you can for example write:
$showfields = array(
'my_special_field1' => 0,
'my_special_field2' => 1,
);
And if you have the "fields" view on the first and second step of your checkout workflow, the field with the column name my_special_field1 will be displayed on the first step, and the field with the column name my_special_field2 will be displayed on the second step.