If you have created a WebForm field that you want to use in other forms, you can save it in the WebForm builder.
To do this, first make sure that the field has been given a Display Name in the edit window.
Next select the Save icon in the corner of the field in the WebForm builder. You will be prompted to confirm that you want to save the field. Select Yes to continue.
After saving, the next time you open the WebForm builder, the saved field will be available in the field list at the right-hand side of the page, searchable by its Display Name.
For more information, take a look at the full help page for the WebForm Builder.
Keywords: Saved WebForm question, load form field