You can use the cPanel email forwarder option to forward your emails to any other email account. However, it will keep a copy at the primary email address and send one copy to the forwarding email account. So eventually, you will have two emails. However, in our case, we need to delete the email in the main account, which is forwarded to the forwarding email account. cPanel doesn't provide this as a direct functionality, but you need to set an email filter rule to achieve this.
Please refer to the following steps to delete the forwarded email copies in cPanel.
1. Log in to your cPanel.
2. Go to Email Filters.
3. Search your email account where you need to set email forwarding and click on Manage Filters >> Create a New Filter.
4. At the Rules section, choose Any Header and Contains and put your email address on which you need to set the email forwarding.
5. At the Actions section, choose Redirect to Email and enter the email account where you want to forward your email account. 
6. Click on the Save button.
This is it. You are done with deleting the forwarded email copies in cPanel.
