How to add New custom column to existing project template

Hi Friends,

I relatively very new to Clarizen!

I have existing 2022 project template.

I have been asked to add two columns (Forecast due date and New due date).

Forecast due date should be editable(Project manager can change this date as and when wanted). New due date should be equal to Forecast due date.

Thanks in advance!

Regards,

Vinayak