What are the different ways through which multiple custom fields are created in BOFC?

User can create multiple fields using multiple ways:
a. Using Excel Template
b. Manually adding multiple rows
c. Directly importing from any source org (linked to current or non-linked org)

Experience it for yourself

Bulk Object Field Creator (BOFC) is a must-have tool, designed specifically for Salesforce.com Administrators, that simplifies many of the tedious tasks of managing a complex Salesforce environment.