Within Teamwork, you can move or copy a task list to another project on your site, or make a copy of it in the current project.
In Table or List view, click the three dots to the right of the relevant task list name and select Move or Copy from the dropdown menu.
In the pop-up modal, you can choose whether to copy or move the task list and also specify a destination project.
You can use this option to copy task lists from one project to another in order to combine two separate projects.
Copying a task list
When copying a task list, you can choose whether you want to include completed tasks in the copy.
Comments and time logged will not be copied.
Moving a task list
When moving a task list to another project, all comments and time logged on the tasks will also be moved to the new project.
If a task being moved is assigned to a person who is not a member of the target project, the task will be re-assigned to Anyone.
For more information, see: Creating a Task List