Steve Diaz,
Greetings from Syncfusion.
It is not possible to achieve the requirement in EJ1 Gantt.
However, I recommend considering the use of EJ2 Gantt instead of EJ1, as it
offers the capability you're looking for. You can find a sample link
demonstrating this feature on the Syncfusion website. If you have any further
questions or need assistance with transitioning to EJ2 Gantt, please feel free
to reach out.
Sample Link : https://ej2.syncfusion.com/demos/#/bootstrap5/gantt/resource-multi-taskbar.html
Regards,
Udhayakumar