While creating custom fields in the Leads module, can I simultaneously create those fields in Accounts, Contacts, and Deals too?

While creating custom fields in the Leads module, can I simultaneously create those fields in Accounts, Contacts, and Deals too?

Yes. When you create custom fields in the Leads module, you have the option of creating those fields in Accounts, Contacts and Deals too.
  1. Click Setup > Customization > Modules and Fields.
  2. Select the desired Module from the list.
  3. In the Leads: List of Fields page, click Create and Edit Fields.
  4. Specify the custom field details and select the Also Create for Accounts, Contacts and Deals check boxes.
  5. Click Save.