You can select the data you want to be deleted from the Settings / Advanced / Reset Data menu and delete all related records.
Card transaction data cannot be deleted.
The data reset feature can only be performed by the system administrator with account owner authority.
Fields where you can reset data collectively:
Persons
Tags & User Defined Fields
Donations
Donation Pages & API Modules
Fundraiser Campaigns
Donation Categories
Debt / Collection Data
Event and Ticket Sales
Certifications
Forms and Answers
Email Templates & Automatic Submissions
Calendar Data
API permissions