It's often faster to duplicate a field and make changes to it, than to create a new field from scratch.
This is especially true for fields with Conditional logic that share the same qualifying questions with another Conditional field, but you can save lots of time duplicating simple fields, too.
To select fields you want to copy, go to: Main Menu > Reuse Fields
Select only the fields you want to copy and click "Copy to clipboard."
Paste the code you copied into the "Paste new field data" text box on the Reuse fields menu.
(You can also paste into the text box on the Reuse fields menu in a different document.)