The scratch area of
the expression editor enables you to store elements of an expression,
and then add them back into the expression as needed.
You can see the contents
of the scratch area on the Scratch tab.
To move items to the
scratch area, right-click part of the expression, and select Move
to Scratch Area. You can also drag and drop items from
your expression onto the Scratch tab.
To move an item from
the scratch area to your expression, drag and drop the item from the Scratch tab
onto your expression.
To delete an item in
the scratch area, click the
button next to the item.